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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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- 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 + Details
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