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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)