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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) - Recurring - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Foreign currency exchange contracts	$ 1,912	$ 1,122
Foreign currency exchange contracts	(1,110)	(1,360)
Interest rate swap agreements	(7)	(131)
Interest rate cap contracts	3,922
Designated as Hedging Instrument | Other assets | Foreign currency exchange contracts
Derivative [Line Items]
Foreign currency exchange contracts	1,912	707
Designated as Hedging Instrument | Other liabilities | Foreign currency exchange contracts
Derivative [Line Items]
Foreign currency exchange contracts	0	(51)
Designated as Hedging Instrument | Other liabilities | Interest rate swap agreements
Derivative [Line Items]
Interest rate swap agreements	(7)	(27)
Derivatives Not Designated as Hedging Instruments | Other assets | Foreign currency exchange contracts
Derivative [Line Items]
Foreign currency exchange contracts	0	415
Derivatives Not Designated as Hedging Instruments | Other assets | Interest rate cap contracts
Derivative [Line Items]
Interest rate cap contracts	3,922	0
Derivatives Not Designated as Hedging Instruments | Other liabilities | Foreign currency exchange contracts
Derivative [Line Items]
Foreign currency exchange contracts	(1,110)	(1,309)
Derivatives Not Designated as Hedging Instruments | Other liabilities | Interest rate swap agreements
Derivative [Line Items]
Interest rate swap agreements	$ 0	$ (104)

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+ References

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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

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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

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- Definition

Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

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- Definition

Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

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