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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] - Foreign Currency Exchange Contracts [Member] - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Other Liabilities [Member] |  |
Derivative [Line Items] |  |
Foreign currency exchange contracts, liabilities | $ (1,010) | $ (1,037)
Other Assets [Member] |  |
Derivative [Line Items] |  |
Foreign currency exchange contracts, assets | 715 | 768
Fair Value, Inputs, Level 2 [Member] | Other Liabilities [Member] |  |
Derivative [Line Items] |  |
Foreign currency exchange contracts, liabilities | (1,010) | (1,037)
Fair Value, Inputs, Level 2 [Member] | Other Assets [Member] |  |
Derivative [Line Items] |  |
Foreign currency exchange contracts, assets | $ 715 | $ 768

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- Definition Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps. + References No definition available. + Details
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- Definition Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into. + References No definition available. + Details
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