Derivatives and Hedging Instruments - Summary of Fair Value of Derivative Instruments as Recorded in Company's Consolidated Statements of Financial Condition (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Other Liabilities [Member] | Foreign Currency Exchange Contracts [Member]
Derivative [Line Items]
Derivatives designated as hedging instruments	$ (601)	$ (1,037)
Other Liabilities [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivatives not designated as hedging instruments	(352)	0
Other Assets [Member] | Foreign Currency Exchange Contracts [Member]
Derivative [Line Items]
Derivatives designated as hedging instruments	$ 718	$ 768