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Summary of Financial Instruments were Denominated in U S Dollars (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2017
USD ($)
Disclosure of detailed information about financial instruments [Line Items]            
Cash     $ 96,626   $ 65,081  
Accounts receivable     372,336   322,585  
Accounts payable and accrued liabilities     $ (274,489)   $ (209,625)  
Canadian Operations [Member] | Currency Risk [Member]            
Disclosure of detailed information about financial instruments [Line Items]            
Cash       $ 957   $ 1,720
Accounts receivable       482    
Accounts payable and accrued liabilities       (20,655)   (13,221)
Net foreign currency exposure       (19,216)   (11,501)
Impact of $0.01 change in the U.S. dollar to Canadian dollar exchange rate on net loss $ (192) $ (115)        
Foreign Operations [Member] | Currency Risk [Member]            
Disclosure of detailed information about financial instruments [Line Items]            
Cash       49,302   39,636
Accounts receivable       181,609   152,216
Accounts payable and accrued liabilities       (122,417)   (98,008)
Long-term liabilities, excluding long-term incentive plans       (7,747)   (8,023)
Net foreign currency exposure       $ 100,747   $ 85,821
Impact of $0.01 change in the U.S. dollar to Canadian dollar exchange rate on comprehensive loss $ 1,007 $ 858