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Derivative Instruments - Summary of Derivatives (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized gains (loss) on derivative instruments $ 13,408 $ (3,197) $ 12,026 $ (6,241)
Total 13,313 (3,197) 18,015 (6,241)
Foreign Currency Contract [Member] | Gain (Loss) on Derivative Instruments [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized gains (loss) on derivative instruments 13,426 (3,135) 12,116 (6,179)
Realized gain (loss) on derivative instruments (95) 0 5,989
Interest Rate Cap [Member] | Gain (Loss) on Derivative Instruments [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized gains (loss) on derivative instruments $ (18) $ (62) $ (90) $ (62)