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Basis of Presentation and Summary of Significant Accounting Policies - Fair Value of Forward Foreign Exchange Contracts (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other current assets $ 129 $ 566
Other current liabilities 730 182
Significant Unobservable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other current assets 129 566
Other current liabilities $ 730 $ 182