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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, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
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 $ 305,977 $ 228,623 $ 366,874 $ 227,574
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 266,899 192,432    
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 $ 4,212 $ 2,936