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	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Measurements, Recurring [Member] | Foreign Currency Exchange Contracts [Member]
Derivatives designated as hedging instruments:
Foreign currency exchange contracts, assets	$ 4,436	$ 718
Foreign currency exchange contracts, liabilities	(342)	(601)
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]
Derivatives not designated as hedging instruments:
Interest rate swap agreements, liabilities	(307)	(352)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Foreign Currency Exchange Contracts [Member]
Derivatives designated as hedging instruments:
Foreign currency exchange contracts, assets	4,436	718
Foreign currency exchange contracts, liabilities	(342)	(601)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Interest Rate Swap [Member]
Derivatives not designated as hedging instruments:
Interest rate swap agreements, liabilities	(307)	(352)
Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring [Member] | Foreign Currency Exchange Contracts [Member] | Other Assets [Member]
Derivatives designated as hedging instruments:
Foreign currency exchange contracts, assets	526	718
Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring [Member] | Foreign Currency Exchange Contracts [Member] | Other Liabilities [Member]
Derivatives designated as hedging instruments:
Foreign currency exchange contracts, liabilities	(342)	(601)
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Other Liabilities [Member]
Derivatives not designated as hedging instruments:
Interest rate swap agreements, liabilities	(307)	(352)
Not Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring [Member] | Foreign Currency Exchange Contracts [Member] | Other Assets [Member]
Derivatives designated as hedging instruments:
Foreign currency exchange contracts, assets	$ 3,910	$ 0