Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Summary of Long-Term Debt

	December 31, 2017 $		December 31, 2016 $
Revolving Credit Facilities	877,343		1,119,808
Senior Notes (8.5%) due January 15, 2020	592,657		592,657
Norwegian Kroner-denominated Bonds due through October 2021	377,856		628,257
U.S. Dollar-denominated Term Loans due through 2031	1,358,798		3,702,997
U.S. Dollar Bonds due through 2024	—		466,680
Euro-denominated Term Loans due through 2023	232,957		219,733
Other U.S. Dollar-denominated loan	10,000		—
Total principal	3,449,611		6,730,132
Less unamortized discount and debt issuance costs	(31,906	)	(90,586	)
Total debt	3,417,705		6,639,546
Less current portion	(800,897	)	(998,591	)
Long-term portion	2,616,808		5,640,955