Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Business Acquisition Purchase Price Allocation Assets Acquired and Liabilities Assumed (Detail)

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Acquisitions - Business Acquisition Purchase Price Allocation Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jul. 20, 2017
Jan. 31, 2018
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Business Acquisition [Line Items]              
Goodwill         $ 43,181 $ 344,200  
All Acquisitions 2018              
Business Acquisition [Line Items]              
Cash paid or payable $ 51,345   $ 51,300 $ 12,100      
Value of Quanta common stock issued 13,549   13,500        
Contingent consideration 13,705   $ 13,700 13,705 13,705 13,705  
Fair value of total consideration transferred or estimated to be transferred 78,599            
Accounts receivable 4,436     4,436 4,436 4,436  
Contract assets 0     0 0 0  
Other current assets 5,722     5,722 5,722 5,722  
Property and equipment 17,516     17,516 17,516 17,516  
Other assets 325     325 325 325  
Identifiable intangible assets 19,836     19,836 19,836 19,836  
Contract liabilities 0     0 0 0  
Other current liabilities (8,238)     (8,238) (8,238) (8,238)  
Deferred tax liabilities, net (4,179)     (4,179) (4,179) (4,179)  
Other long-term liabilities 0     0 0 0  
Total identifiable net assets 35,418     35,418 35,418 35,418  
Goodwill 43,181            
Fair value of total consideration transferred or estimated to be transferred 78,599     78,599 78,599 78,599  
Stronghold              
Business Acquisition [Line Items]              
Cash paid or payable 351,014 $ 351,000          
Value of Quanta common stock issued 81,337 81,300          
Contingent consideration 51,084 $ 51,100   51,084 51,084 51,084  
Fair value of total consideration transferred or estimated to be transferred 483,435            
Accounts receivable 77,478     77,478 77,478 77,478  
Contract assets 11,913     11,913 11,913 11,913  
Other current assets 20,914     20,914 20,914 20,914  
Property and equipment 51,258     51,258 51,258 51,258  
Other assets 1,513     1,513 1,513 1,513  
Identifiable intangible assets 95,700     95,700 95,700 95,700  
Contract liabilities (13,489)     (13,489) (13,489) (13,489)  
Other current liabilities (58,346)     (58,346) (58,346) (58,346)  
Deferred tax liabilities, net 0     0 0 0  
Other long-term liabilities (48)     (48) (48) (48)  
Total identifiable net assets 186,893     186,893 186,893 186,893  
Goodwill 296,542            
Fair value of total consideration transferred or estimated to be transferred 483,435     483,435 483,435 483,435  
Acquisitions 2017, other than Stronghold              
Business Acquisition [Line Items]              
Cash paid or payable 11,955           $ 12,000
Value of Quanta common stock issued 8,267           $ 8,300
Contingent consideration 0     0 0 0  
Fair value of total consideration transferred or estimated to be transferred 20,222            
Accounts receivable 7,157     7,157 7,157 7,157  
Contract assets 193     193 193 193  
Other current assets 170     170 170 170  
Property and equipment 1,480     1,480 1,480 1,480  
Other assets 12     12 12 12  
Identifiable intangible assets 8,091     8,091 8,091 8,091  
Contract liabilities (93)     (93) (93) (93)  
Other current liabilities (2,705)     (2,705) (2,705) (2,705)  
Deferred tax liabilities, net 0     0 0 0  
Other long-term liabilities 0     0 0 0  
Total identifiable net assets 14,305     14,305 14,305 14,305  
Goodwill 5,917            
Fair value of total consideration transferred or estimated to be transferred $ 20,222     $ 20,222 $ 20,222 $ 20,222