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Derivatives - Offsetting of Derivative Instruments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Offsetting Assets [Line Items]    
Gross Amounts, Assets $ 166,107 $ 119,466
Gross Amounts Offset, Assets (141,362) (106,797)
Net Amounts Presented in the Statements of Financial Condition, Assets 24,745 12,669
Gross Amounts Not Offset, Financial Instruments, Assets 0 0
Gross Amounts Not Offset, Cash Collateral Received, Assets 0 0
Net Amount, Assets 24,745 12,669
Gross Amounts, Liabilities 154,515 114,730
Gross Amounts Offset, Liabilities (141,362) (106,797)
Net Amounts Presented in the Statements of Financial Condition, Liabilities 13,153 7,933
Gross Amounts Not Offset, Financial Instruments, Liabilities 0 0
Gross Amounts Not Offset, Cash Collateral Received, Liabilities 0 0
Net Amount, Liabilities 13,153 7,933
Foreign Exchange/Commodities Options [Member]    
Offsetting Assets [Line Items]    
Gross Amounts, Assets 102,667 31,834
Gross Amounts Offset, Assets (98,736) (27,418)
Net Amounts Presented in the Statements of Financial Condition, Assets 3,931 4,416
Gross Amounts Not Offset, Financial Instruments, Assets 0 0
Gross Amounts Not Offset, Cash Collateral Received, Assets 0 0
Net Amount, Assets 3,931 4,416
Gross Amounts, Liabilities 98,736 27,548
Gross Amounts Offset, Liabilities (98,736) (27,418)
Net Amounts Presented in the Statements of Financial Condition, Liabilities 0 130
Gross Amounts Not Offset, Financial Instruments, Liabilities 0 0
Gross Amounts Not Offset, Cash Collateral Received, Liabilities 0 0
Net Amount, Liabilities 0 130
Foreign Exchange Swaps [Member]    
Offsetting Assets [Line Items]    
Gross Amounts, Assets 1,249 1,135
Gross Amounts Offset, Assets (306) (334)
Net Amounts Presented in the Statements of Financial Condition, Assets 943 801
Gross Amounts Not Offset, Financial Instruments, Assets 0 0
Gross Amounts Not Offset, Cash Collateral Received, Assets 0 0
Net Amount, Assets 943 801
Gross Amounts, Liabilities 1,033 3,180
Gross Amounts Offset, Liabilities (306) (334)
Net Amounts Presented in the Statements of Financial Condition, Liabilities 727 2,846
Gross Amounts Not Offset, Financial Instruments, Liabilities 0 0
Gross Amounts Not Offset, Cash Collateral Received, Liabilities 0 0
Net Amount, Liabilities 727 2,846
Interest Rate Swaps [Member]    
Offsetting Assets [Line Items]    
Gross Amounts, Assets   242
Gross Amounts Offset, Assets   0
Net Amounts Presented in the Statements of Financial Condition, Assets   242
Gross Amounts Not Offset, Financial Instruments, Assets   0
Gross Amounts Not Offset, Cash Collateral Received, Assets   0
Net Amount, Assets   242
Equity Options [Member]    
Offsetting Assets [Line Items]    
Gross Amounts, Liabilities   18
Gross Amounts Offset, Liabilities   0
Net Amounts Presented in the Statements of Financial Condition, Liabilities   18
Gross Amounts Not Offset, Financial Instruments, Liabilities   0
Gross Amounts Not Offset, Cash Collateral Received, Liabilities   0
Net Amount, Liabilities   18
Forwards [Member]    
Offsetting Assets [Line Items]    
Gross Amounts, Assets 9,900 4,363
Gross Amounts Offset, Assets (12) (101)
Net Amounts Presented in the Statements of Financial Condition, Assets 9,888 4,262
Gross Amounts Not Offset, Financial Instruments, Assets 0 0
Gross Amounts Not Offset, Cash Collateral Received, Assets 0 0
Net Amount, Assets 9,888 4,262
Gross Amounts, Liabilities 2,648 1,584
Gross Amounts Offset, Liabilities (12) (101)
Net Amounts Presented in the Statements of Financial Condition, Liabilities 2,636 1,483
Gross Amounts Not Offset, Financial Instruments, Liabilities 0 0
Gross Amounts Not Offset, Cash Collateral Received, Liabilities 0 0
Net Amount, Liabilities 2,636 1,483
Rate Lock Commitments [Member]    
Offsetting Assets [Line Items]    
Gross Amounts, Assets 8,750 2,923
Gross Amounts Offset, Assets 0 0
Net Amounts Presented in the Statements of Financial Condition, Assets 8,750 2,923
Gross Amounts Not Offset, Financial Instruments, Assets 0 0
Gross Amounts Not Offset, Cash Collateral Received, Assets 0 0
Net Amount, Assets 8,750 2,923
Gross Amounts, Liabilities 8,980 2,390
Gross Amounts Offset, Liabilities 0 0
Net Amounts Presented in the Statements of Financial Condition, Liabilities 8,980 2,390
Gross Amounts Not Offset, Financial Instruments, Liabilities 0 0
Gross Amounts Not Offset, Cash Collateral Received, Liabilities 0 0
Net Amount, Liabilities 8,980 2,390
Futures [Member]    
Offsetting Assets [Line Items]    
Gross Amounts, Assets 43,541 78,969
Gross Amounts Offset, Assets (42,308) (78,944)
Net Amounts Presented in the Statements of Financial Condition, Assets 1,233 25
Gross Amounts Not Offset, Financial Instruments, Assets 0 0
Gross Amounts Not Offset, Cash Collateral Received, Assets 0 0
Net Amount, Assets 1,233 25
Gross Amounts, Liabilities 43,118 80,010
Gross Amounts Offset, Liabilities (42,308) (78,944)
Net Amounts Presented in the Statements of Financial Condition, Liabilities 810 1,066
Gross Amounts Not Offset, Financial Instruments, Liabilities 0 0
Gross Amounts Not Offset, Cash Collateral Received, Liabilities 0 0
Net Amount, Liabilities $ 810 $ 1,066