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Derivative Instruments - Summary of Derivatives (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) on derivative instruments - unrealized $ (7,302,000) $ (10,297,000) $ (17,626,000) $ 1,731,000
Gain (loss) on derivative instruments - realized     (289,000) 21,100,000
Sub-total (7,481,000) 4,815,000 (17,916,000) 22,831,000
Total (7,481,000) 4,815,000 (18,503,000) 22,831,000
Foreign Currency Contract [Member] | Gain (Loss) on Derivative Instruments [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) on derivative instruments - unrealized (7,308,000) (10,304,000) (17,629,000) 1,812,000
Gain (loss) on derivative instruments - realized (179,000) 15,112,000 (290,000) 21,100,000
Foreign Currency Contract [Member] | Income (loss) From Unconsolidated Joint Venture [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) on derivative instruments - realized 0 0 (587,000) 0
Interest Rate Cap [Member] | Gain (Loss) on Derivative Instruments [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) on derivative instruments - unrealized 6,000 7,000 3,000 (81,000)
Aggregate notional amount $ 41,507,000 $ 46,798,000 $ 41,507,000 $ 46,798,000