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Summary of Financial Instruments were Denominated in U S Dollars (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2019
CAD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Disclosure of detailed information about financial instruments [Line Items]              
Cash     $ 74,701     $ 96,626  
Accounts receivable     310,204     372,336  
Accounts payable and accrued liabilities     $ (199,478)   $ (2,800) $ (274,489)  
Canadian Operations [Member] | Currency Risk [Member]              
Disclosure of detailed information about financial instruments [Line Items]              
Cash       $ 9,727     $ 957
Accounts receivable       242     482
Accounts payable and accrued liabilities       (17,730)     (20,655)
Net foreign currency exposure       (7,761)     (19,216)
Impact of $0.01 change in the U.S. dollar to Canadian dollar exchange rate on net earnings (loss) $ (78) $ (192)          
Foreign Operations [Member] | Currency Risk [Member]              
Disclosure of detailed information about financial instruments [Line Items]              
Cash       41,154     49,302
Accounts receivable       150,873     181,609
Accounts payable and accrued liabilities       (86,324)     (122,417)
Long-term liabilities, excluding long-term incentive plans       (7,669)     (7,747)
Net foreign currency exposure       $ 98,034     $ 100,747
Impact of $0.01 change in the U.S. dollar to Canadian dollar exchange rate on comprehensive loss $ 980 $ 1,007