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Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Parenthetical) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash/Non-negotiable time deposits - not subject to fair value disclosure requirements $ 366,874 $ 227,574 $ 195,147 $ 305,437
Cash [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash/Non-negotiable time deposits - not subject to fair value disclosure requirements 349,885 110,118    
Non-Negotiable Time Deposits [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash/Non-negotiable time deposits - not subject to fair value disclosure requirements $ 1,453 $ 11,016