Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Detail)

v3.2.0.727
Commitments and Contingencies - Additional Information (Detail)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 09, 2013
USD ($)
Dec. 31, 2014
USD ($)
Customer
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Customer
km
Jun. 30, 2014
USD ($)
Customer
Jun. 30, 2015
USD ($)
Customer
Agency
km
Jun. 30, 2014
USD ($)
Customer
Dec. 31, 2014
USD ($)
Customer
Jul. 31, 2014
USD ($)
Dec. 31, 2011
USD ($)
Apr. 21, 2010
mi
Commitment And Contingencies [Line Items]                      
Outstanding capital commitment           $ 8,700,000          
Rent expense related to operating leases       $ 50,900,000 $ 42,600,000 100,200,000 $ 77,200,000        
Maximum guaranteed residual value       $ 469,400,000   $ 469,400,000          
Number of customers representing ten percent or more of consolidated revenues | Customer       0 0 0 0        
Number of customers representing ten percent or more of net position | Customer   0   0   0   0      
Gross amount accrued for insurance claims   $ 170,200,000   $ 177,000,000   $ 177,000,000   $ 170,200,000      
Long-term insurance claims   130,800,000   144,100,000   144,100,000   130,800,000      
Related insurance recoveries/receivables   9,100,000   10,100,000   10,100,000   9,100,000      
Related insurance recoveries/receivables included in prepaid expenses and other current assets   800,000   500,000   500,000   800,000      
Related insurance recoveries/receivables included in other assets net   8,300,000   9,600,000   9,600,000   $ 8,300,000      
Letters of credit and bank guarantees under the credit facility       324,700,000   324,700,000          
Total amount of outstanding performance bonds       2,700,000,000   2,700,000,000          
Estimated cost to complete bonded projects       744,000,000   744,000,000          
Multi-employer plan withdrawal obligation                 $ 39,600,000 $ 32,600,000  
Multi-employer plan withdrawal obligation, amount suggested by Plan which is different than amount recorded by company $ 6,900,000                    
Multi-employer plan withdrawal obligation complete withdrawal 4,800,000                    
Multi-employer plan withdrawal obligation accrued           2,600,000          
Cash proceeds deposited in Escrow account $ 2,100,000                    
Pre-acquisition non-U.S.tax obligations and indemnification asset amount recorded       11,400,000   11,400,000          
Pre-acquisition non-U.S.tax obligations and indemnification liability amount recorded       $ 11,400,000   $ 11,400,000          
Alberta Power Line [Member]                      
Commitment And Contingencies [Line Items]                      
Length of electrical transmission line to be constructed under contract | km       500   500          
Sunrise Powerlink Project [Member]                      
Commitment And Contingencies [Line Items]                      
Length of electrical transmission line to be constructed under contract | mi                     117
Proceeds from customers   $ 65,000,000                  
Scenario Forecast [Member]                      
Commitment And Contingencies [Line Items]                      
Outstanding capital commitment     $ 200,000                
June 1, 2017 [Member]                      
Commitment And Contingencies [Line Items]                      
Outstanding capital commitment           $ 8,500,000          
Vehicle Fleet Committed Capital [Member]                      
Commitment And Contingencies [Line Items]                      
Estimated committed capital remainder of current year       $ 6,300,000   6,300,000          
Minimum [Member]                      
Commitment And Contingencies [Line Items]                      
Multi-employer plan withdrawal obligation       $ 40,100,000   $ 40,100,000          
Minimum [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]                      
Commitment And Contingencies [Line Items]                      
Concentration risk percentage       10.00% 10.00% 10.00% 10.00%        
Minimum [Member] | Net Position [Member] | Customer Concentration Risk [Member]                      
Commitment And Contingencies [Line Items]                      
Concentration risk percentage           10.00%   10.00%      
Maximum [Member]                      
Commitment And Contingencies [Line Items]                      
Multi-employer plan withdrawal obligation       $ 55,400,000   $ 55,400,000          
Lorenzo Benton v Telecom Network Specialists Inc [Member]                      
Commitment And Contingencies [Line Items]                      
Number of staffing Agency | Agency           29          
Lorenzo Benton v Telecom Network Specialists Inc [Member] | Class Damage [Member]                      
Commitment And Contingencies [Line Items]                      
Amount sought by plaintiff           $ 16,000,000          
Lorenzo Benton v Telecom Network Specialists Inc [Member] | Attorney Fees [Member]                      
Commitment And Contingencies [Line Items]                      
Amount sought by plaintiff           $ 5,000,000