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Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Parenthetical) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 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 $ 333,768 $ 228,623 $ 227,574 $ 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 292,808 192,432    
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 $ 3,398 $ 2,936