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Fair Value Measurements - Fair Value of Financial Instruments and Other Non-Financial Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash, cash equivalents and restricted cash $ 505,639 $ 552,174 $ 805,242 $ 854,829
Loans to equity-accounted investees 169,197 107,486    
Long-term debt – non-public (note 8) (3,319,523) (3,417,705)    
Obligations related to capital leases, including current portion (note 10) (1,673,845) (1,160,457)    
Carrying Amount Asset (Liability)        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans to equity-accounted investees 169,197 107,486    
Loans to equity-accounted investees and joint venture partners – Long-term 62,207 146,420    
Carrying Amount Asset (Liability) | Level 1        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term debt – public (note 8) (856,986) (963,563)    
Carrying Amount Asset (Liability) | Level 2        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term debt – non-public (note 8) (2,462,537) (2,454,142)    
Obligations related to capital leases, including current portion (note 10) (1,673,845) (1,160,457)    
Carrying Amount Asset (Liability) | Level 3        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term receivable included in accounts receivable and other assets 175 3,476    
Carrying Amount Asset (Liability) | Recurring | Level 1        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash, cash equivalents and restricted cash 505,639 552,174    
Carrying Amount Asset (Liability) | Recurring | Level 2 | Interest Rate Swap Agreements        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Interest rate swap agreements - assets 9,640 6,081    
Interest rate swap agreements - liabilities (43,175) (78,560)    
Carrying Amount Asset (Liability) | Recurring | Level 2 | Cross Currency Interest Swap Agreement        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Interest rate swap agreements - assets 0 3,758    
Interest rate swap agreements - liabilities (29,122) (54,217)    
Carrying Amount Asset (Liability) | Recurring | Level 2 | Foreign Currency Contracts        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cross currency interest swap agreement and foreign currency contracts 0 81    
Carrying Amount Asset (Liability) | Recurring | Level 2 | Forward freight agreements        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Freight forward agreements (57) 0    
Carrying Amount Asset (Liability) | Recurring | Level 3 | Stock Purchase Warrants | Derivatives Not Designated as a Cash Flow Hedge        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Stock purchase warrants 12,026 30,749    
Carrying Amount Asset (Liability) | Non-recurring | Level 2        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Vessels held for sale (note 18) 0 16,671    
Fair Value Asset (Liability) | Level 1        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term debt – public (note 8) (851,470) (979,773)    
Fair Value Asset (Liability) | Level 2        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term debt – non-public (note 8) (2,395,300) (2,421,273)    
Obligations related to capital leases, including current portion (note 10) (1,652,345) (1,148,989)    
Fair Value Asset (Liability) | Level 3        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term receivable included in accounts receivable and other assets 174 3,459    
Fair Value Asset (Liability) | Recurring | Level 1        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash, cash equivalents and restricted cash 505,639 552,174    
Fair Value Asset (Liability) | Recurring | Level 2 | Interest Rate Swap Agreements        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Interest rate swap agreements - assets 9,640 6,081    
Interest rate swap agreements - liabilities (43,175) (78,560)    
Fair Value Asset (Liability) | Recurring | Level 2 | Cross Currency Interest Swap Agreement        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Interest rate swap agreements - assets 0 3,758    
Interest rate swap agreements - liabilities (29,122) (54,217)    
Fair Value Asset (Liability) | Recurring | Level 2 | Foreign Currency Contracts        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cross currency interest swap agreement and foreign currency contracts 0 81    
Fair Value Asset (Liability) | Recurring | Level 2 | Forward freight agreements        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Freight forward agreements (57) 0    
Fair Value Asset (Liability) | Recurring | Level 3 | Stock Purchase Warrants | Derivatives Not Designated as a Cash Flow Hedge        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Stock purchase warrants 12,026 30,749    
Fair Value Asset (Liability) | Non-recurring | Level 2        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Vessels held for sale (note 18) $ 0 $ 16,671