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Fair Value of Financial Instruments and Other Non-Financial Assets (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Recurring        
Cash, cash equivalents, restricted cash and restricted cash equivalents $ 545,026 $ 552,174 $ 814,758 $ 805,242
Non-recurring        
Assets held for sale (note 7) 29,911 33,671    
Other        
Loans to equity-accounted investees and joint venture partners - Current 66,161 107,486    
Long-term debt (3,349,333) (3,417,705)    
Accrued Liabilities, Fair Value Disclosure 4,000 5,700    
Carrying Amount Asset (Liability)        
Other        
Loans to equity-accounted investees and joint venture partners - Current 66,161 107,486    
Loans to equity-accounted investees and joint venture partners - Long-term 166,328 146,420    
Carrying Amount Asset (Liability) | Level 1 | Public        
Other        
Long-term debt (961,344) (963,563)    
Carrying Amount Asset (Liability) | Level 2 | Non-public        
Other        
Long-term debt (2,387,989) (2,454,142)    
Obligations related to capital leases, including current portion (1,352,198) (1,160,457)    
Carrying Amount Asset (Liability) | Level 3        
Other        
Long-term receivable included in accounts receivable and other assets 1,200 3,476    
Carrying Amount Asset (Liability) | Recurring | Level 1        
Recurring        
Cash, cash equivalents, restricted cash and restricted cash equivalents 545,026 552,174    
Carrying Amount Asset (Liability) | Recurring | Level 1 | Freight forward agreements        
Recurring        
Derivative Asset, Current 18 0    
Carrying Amount Asset (Liability) | Recurring | Level 2 | Interest rate swap agreements        
Recurring        
Interest rate swap agreements – assets 15,503 6,081    
Interest rate swap agreements – liabilities (56,233) (78,560)    
Carrying Amount Asset (Liability) | Recurring | Level 2 | Cross currency interest swap agreement        
Recurring        
Cross currency interest swap agreements – assets 6,449 3,758    
Cross currency interest swap agreements – liabilities (50,975) (54,217)    
Carrying Amount Asset (Liability) | Recurring | Level 2 | Foreign currency contracts        
Recurring        
Cross currency interest swap agreement and Foreign currency contracts 0 81    
Carrying Amount Asset (Liability) | Recurring | Level 3 | Stock purchase warrants        
Recurring        
Other Non-Current Assets 35,271 30,749    
Carrying Amount Asset (Liability) | Non-recurring | Level 2        
Non-recurring        
Vessels and equipment (note 7) 65,209 0    
Assets held for sale (note 7) 0 16,671    
Fair Value Asset (Liability) | Level 1 | Public        
Other        
Long-term debt (992,612) (979,773)    
Fair Value Asset (Liability) | Level 2 | Non-public        
Other        
Long-term debt (2,355,850) (2,421,273)    
Obligations related to capital leases, including current portion (1,306,537) (1,148,989)    
Fair Value Asset (Liability) | Level 3        
Other        
Long-term receivable included in accounts receivable and other assets 1,194 3,459    
Fair Value Asset (Liability) | Recurring | Level 1        
Recurring        
Cash, cash equivalents, restricted cash and restricted cash equivalents 545,026 552,174    
Fair Value Asset (Liability) | Recurring | Level 1 | Freight forward agreements        
Recurring        
Derivative Asset, Current 18 0    
Fair Value Asset (Liability) | Recurring | Level 2 | Interest rate swap agreements        
Recurring        
Interest rate swap agreements – assets 15,503 6,081    
Interest rate swap agreements – liabilities (56,233) (78,560)    
Fair Value Asset (Liability) | Recurring | Level 2 | Cross currency interest swap agreement        
Recurring        
Cross currency interest swap agreements – assets 6,449 3,758    
Cross currency interest swap agreements – liabilities (50,975) (54,217)    
Fair Value Asset (Liability) | Recurring | Level 2 | Foreign currency contracts        
Recurring        
Cross currency interest swap agreement and Foreign currency contracts 0 81    
Fair Value Asset (Liability) | Recurring | Level 3 | Stock purchase warrants        
Recurring        
Other Non-Current Assets 35,271 30,749    
Fair Value Asset (Liability) | Non-recurring | Level 2        
Non-recurring        
Vessels and equipment (note 7) 65,209 0    
Assets held for sale (note 7) $ 0 $ 16,671    
BG Joint Venture | Supply Commitment        
Other        
Fair Value Inputs, Discount Rate 8.00% 8.00%    
BG Joint Venture | Supply Commitment | Fair Value Asset (Liability) | Level 3        
Other        
Long-term receivable included in accounts receivable and other assets $ 1,200 $ 3,500