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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, 2018
Dec. 31, 2017
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 $ 362,252 $ 292,808
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