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Long-Term Debt (Tables)
12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Summary of Long-Term Debt
 
Year Ended December 31,
 
2019
$
 
2018
$
Revolving credit facilities due through 2022
341,132

 
417,997

Term loans due through 2021
221,729

 
323,995

Total principal
562,861


741,992

Less: unamortized discount and debt issuance costs
(3,182
)
 
(6,586
)
Total debt
559,679


735,406

Less: current portion
(43,573
)
 
(106,236
)
Non-current portion of long-term debt
516,106


629,170