Derivatives and Hedging Instruments - Summary of Fair Value of Derivative Instruments as Recorded in Company's Consolidated Statements of Financial Condition (Detail) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Other Liabilities [Member] | Foreign Currency Exchange Contracts [Member]
Derivative [Line Items]
Foreign currency exchange contracts, liabilities	$ (1,449)	$ (4,123)
Other Assets [Member] | Foreign Currency Exchange Contracts [Member]
Derivative [Line Items]
Foreign currency exchange contracts, assets	791	46
Other Assets [Member] | Interest Rate Cap [Member]
Derivative [Line Items]
Interest rate cap, assets	4	202
Fair Value, Inputs, Level 2 [Member] | Other Liabilities [Member] | Foreign Currency Exchange Contracts [Member]
Derivative [Line Items]
Foreign currency exchange contracts, liabilities	(1,449)	(4,123)
Fair Value, Inputs, Level 2 [Member] | Other Assets [Member] | Foreign Currency Exchange Contracts [Member]
Derivative [Line Items]
Foreign currency exchange contracts, assets	791	46
Fair Value, Inputs, Level 2 [Member] | Other Assets [Member] | Interest Rate Cap [Member]
Derivative [Line Items]
Interest rate cap, assets	$ 4	$ 202