Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Schedule of Amounts of Non-hedging Derivative Financial Instruments (Detail)

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Summary of Significant Accounting Policies - Schedule of Amounts of Non-hedging Derivative Financial Instruments (Detail) - Derivatives Not Designated as Hedging Instruments [Member] - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 3 $ 9
Liability Derivatives 5 19
Forward Purchase Contracts [Member] | Prepaid Expenses and Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 3 9
Forward Purchase Contracts [Member] | Accrued Liabilities Current [Member]    
Derivatives, Fair Value [Line Items]    
Liability Derivatives $ 5 $ 19