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Summary of Financial Instruments were Denominated in U S Dollars (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2019
CAD ($)
Disclosure of detailed information about financial instruments [Line Items]              
Cash     $ 108,772   $ 74,701    
Accounts receivable     207,209   310,204    
Accounts payable and accrued liabilities     $ (150,957)   $ (199,478)   $ (2,800)
Canadian Operations [Member] | Currency Risk [Member]              
Disclosure of detailed information about financial instruments [Line Items]              
Cash       $ 35,257   $ 9,727  
Accounts receivable           242  
Accounts payable and accrued liabilities       (18,727)   (17,730)  
Net foreign currency exposure       16,530   (7,761)  
Impact of $0.01 change in the U.S. dollar to Canadian dollar exchange rate on net earnings (loss) $ 165 $ (78)          
Foreign Operations [Member] | Currency Risk [Member]              
Disclosure of detailed information about financial instruments [Line Items]              
Cash       26,057   41,154  
Accounts receivable       98,298   150,873  
Accounts payable and accrued liabilities       (59,704)   (86,324)  
Long-term liabilities, excluding long-term incentive plans       (16,197)   (7,669)  
Net foreign currency exposure       $ 48,454   $ 98,034  
Impact of $0.01 change in the U.S. dollar to Canadian dollar exchange rate on comprehensive loss $ 485 $ 980