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Derivative Instruments - Fair Values of Derivative Instruments (Detail) - Non-Designated Derivatives - Forward Currency Exchange Contracts
$ in Thousands
Dec. 31, 2017
USD ($)
Derivatives Fair Value [Line Items]  
Derivative Liabilities, Notional Amount $ 12,039
Gross Amounts of Recognized Financial Instruments, Liabilities 55
Net Amounts of Assets Presented in the Consolidated Balance, Liabilities $ 55 [1]
[1] Represents the fair value of forward currency contracts, which is recorded in “Accounts payable and accrued expenses” in the consolidated balance sheets.