XML 460 R77.htm IDEA: XBRL DOCUMENT v3.21.1
Long-Term Debt - Summary of Long-Term Debt (Detail) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
May 31, 2019
Nov. 30, 2015
Jan. 27, 2010
Debt Instrument [Line Items]          
Long-term Debt, Gross $ 2,087,083,000 $ 2,867,120,000      
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net 31,976,000 39,968,000      
Long-term Debt 2,055,107,000 2,827,152,000      
Current portion of long-term debt (note 8) 261,366,000 523,312,000      
Long-term Debt, Excluding Current Maturities 1,793,741,000 2,303,840,000      
Senior Notes (8.5%) due January 15, 2020          
Debt Instrument [Line Items]          
Long-term Debt, Gross $ 0 $ 36,712,000      
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 8.50% 8.50%   8.50% 8.50%
Senior Notes due 2022 [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross $ 243,395,000 $ 250,000,000      
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 9.25% 9.25% 9.25%    
Debt Instrument, Repurchase Amount $ 6,200,000        
Convertible Senior Notes (5%) due January 15, 2023          
Debt Instrument [Line Items]          
Long-term Debt, Gross $ 112,184,000 $ 125,000,000      
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 5.00% 5.00%      
Debt Instrument, Repurchase Amount $ 10,500,000        
Norwegian Krone-denominated Bonds due through September 2025          
Debt Instrument [Line Items]          
Long-term Debt, Gross 355,514,000 $ 347,163,000      
U.S. Dollar-denominated Term Loans due through 2030          
Debt Instrument [Line Items]          
Long-term Debt, Gross 938,280,000 1,336,437,000      
Euro-denominated Term Loans due through 2024          
Debt Instrument [Line Items]          
Long-term Debt, Gross 152,710,000 165,376,000      
Other U.S. Dollar-denominated loan          
Debt Instrument [Line Items]          
Long-term Debt, Gross 0 3,300,000      
Revolving Credit Facilities          
Debt Instrument [Line Items]          
Long-term Debt, Gross $ 285,000,000 $ 603,132,000