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Effect of Master Netting Arrangements on Presentation of Derivative Assets and Liabilities in Consolidated Statements of Financial Condition (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Derivative Financial Instruments, Liabilities    
Derivatives, Fair Value [Line Items]    
Gross Amounts of Recognized Liabilities $ 4,322 $ 8,208
Gross Amounts Offset in the Statement of Condition 3,986 7,696
Net Amounts of Liabilities Presented in the Statement of Condition 336 512
Financial Instruments 0 0
Cash Collateral Received 0 0
Net Amount 336 512
Derivative Financial Instruments, Assets    
Derivatives, Fair Value [Line Items]    
Gross Amounts Of Recognized Assets 5,743 [1] 15,481 [2]
Gross Amounts Offset in the Statement of Condition 1,024 7,198
Net Amounts of Assets Presented in the Statement of Condition 4,719 8,283
Financial Instruments 0 0
Cash Collateral Received 0 0
Net Amount $ 4,719 $ 8,283
[1] Includes $1.9 million to purchase Treasury options.
[2] Includes $2.6 million to purchase Treasury options.