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Revenue - Summary of Performance Obligations (Detail) - CAD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Disclosure of performance obligations [line items]    
Revenue from performance obligations satisfied or partially satisfied in previous periods $ 1,700,000 $ 1,658,380
Less than one year [Member]    
Disclosure of performance obligations [line items]    
Revenue from performance obligations satisfied or partially satisfied in previous periods 829,326 748,652
One to two years [Member]    
Disclosure of performance obligations [line items]    
Revenue from performance obligations satisfied or partially satisfied in previous periods 151,360 155,508
Greater than two years [Member]    
Disclosure of performance obligations [line items]    
Revenue from performance obligations satisfied or partially satisfied in previous periods 719,314 754,220
Engineered Systems [Member]    
Disclosure of performance obligations [line items]    
Revenue from performance obligations satisfied or partially satisfied in previous periods 619,988 557,549
Engineered Systems [Member] | Less than one year [Member]    
Disclosure of performance obligations [line items]    
Revenue from performance obligations satisfied or partially satisfied in previous periods 619,294 556,844
Engineered Systems [Member] | One to two years [Member]    
Disclosure of performance obligations [line items]    
Revenue from performance obligations satisfied or partially satisfied in previous periods 694 705
Engineered Systems [Member] | Greater than two years [Member]    
Disclosure of performance obligations [line items]    
Revenue from performance obligations satisfied or partially satisfied in previous periods 0 0
Service [Member]    
Disclosure of performance obligations [line items]    
Revenue from performance obligations satisfied or partially satisfied in previous periods 92,139 91,294
Service [Member] | Less than one year [Member]    
Disclosure of performance obligations [line items]    
Revenue from performance obligations satisfied or partially satisfied in previous periods 35,645 33,192
Service [Member] | One to two years [Member]    
Disclosure of performance obligations [line items]    
Revenue from performance obligations satisfied or partially satisfied in previous periods 14,435 13,437
Service [Member] | Greater than two years [Member]    
Disclosure of performance obligations [line items]    
Revenue from performance obligations satisfied or partially satisfied in previous periods 42,059 44,665
Energy Infrastructure [Member]    
Disclosure of performance obligations [line items]    
Revenue from performance obligations satisfied or partially satisfied in previous periods 987,873 1,009,537
Energy Infrastructure [Member] | Less than one year [Member]    
Disclosure of performance obligations [line items]    
Revenue from performance obligations satisfied or partially satisfied in previous periods 174,387 158,616
Energy Infrastructure [Member] | One to two years [Member]    
Disclosure of performance obligations [line items]    
Revenue from performance obligations satisfied or partially satisfied in previous periods 136,231 141,366
Energy Infrastructure [Member] | Greater than two years [Member]    
Disclosure of performance obligations [line items]    
Revenue from performance obligations satisfied or partially satisfied in previous periods $ 677,255 $ 709,555