Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v2.4.0.6
Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 2 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Jun. 30, 2011
Howard Midstream Energy Partners, LLC. [Member]
Apr. 30, 2012
Howard Midstream Energy Partners, LLC. [Member]
Jun. 22, 2011
Howard Midstream Energy Partners, LLC. [Member]
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2012
Maximum [Member]
Dec. 31, 2012
Fiber Optic Licensing [Member]
Dec. 31, 2011
Fiber Optic Licensing [Member]
Dec. 31, 2012
Internally Developed Software [Member]
Dec. 31, 2011
Internally Developed Software [Member]
Summary Of Significant Accounting Policies [Line Items]                          
Acquired ownership interest in HEP           31.00% 39.00% 20.00% 50.00%        
Cash and cash equivalents $ 394,701,000 $ 315,349,000 $ 539,221,000 $ 699,629,000                  
Cash equivalents 92,500,000 165,900,000                      
Cash and cash equivalents held in domestic bank accounts 254,100,000 230,900,000                      
Cash and cash equivalents held in foreign bank accounts 140,600,000 84,400,000                      
Number of days after accounts receivable are treated as delinquent 30 days                        
Number of days related to outstanding accounts receivable for analysis of the allowance for doubtful accounts At least 90 days                        
Total allowances for doubtful accounts 5,447,000 3,751,000 5,962,000                    
Current retainage balances 180,600,000 111,900,000                      
Non-current retainage balances 22,500,000 28,300,000                      
Unbilled receivables 127,500,000 121,100,000                      
Depreciation expense related to property and equipment 120,303,000 109,874,000 101,199,000                    
Construction work-in-progress 33,546,000 29,502,000               19,000,000 14,100,000 2,100,000 8,000,000
Net property and equipment reclassified to prepaid expenses and other current assets and deemed assets held for sale     8,200,000                    
Net losses from the impairment of assets held for sale     100,000                    
Debt issuance costs related to amendment   4,127,000                      
Debt issuance cost write off   300,000                      
Capitalized debt issuance costs 4,400,000 4,400,000                      
Accumulated amortization of debt issuance costs 1,300,000 400,000                      
Amortization expense related to capitalized debt issuance costs 904,000 901,000 642,000                    
Decrease in fair value of reporting units considered, for impairment calculation 10.00%                        
Payment to acquire equity method investments (53,750,000) (35,000,000)     (35,000,000) (52,300,000)              
Number of shares acquired in equity method investment           45,435              
Change orders and/or claims 205,000,000 77,300,000                      
Fiber Optic Licensing Terms, Minimum in years 5 years                        
Fiber Optic Licensing Terms, Maximum in years 25 years                        
Fiber optic deferred revenue 46,400,000 47,400,000                      
Fiber optic non-current deferred revenue 37,700,000 38,300,000                      
Total amount of unrecognized tax benefits relating to uncertain tax positions 51,244,000 47,379,000 50,632,000 45,201,000                  
Expected increase in amount due to tax position 15,411,000 10,133,000 10,602,000                    
Decrease in amount due to the expiration of certain statutes of limitations 11,965,000 8,640,000 10,261,000                    
Amount expected to decrease due to settlements of audits or as a result of the expiration of certain statutes of limitations $ 11,479,000 $ 12,110,000 $ 8,786,000