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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

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