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Fair Value Measurements - Fair Value of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Warehouse receivables | $ 1,276,047 | $ 1,767,107
Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 57,074 | 56,562
Trading securities | 52,629 | 64,124
Warehouse receivables | 1,276,047 | 1,767,107
Loan commitments |  | 1,680
Foreign currency exchange forward contracts | 1,471 | 9,236
Total assets at fair value | 1,387,221 | 1,898,709
Interest rate swaps | 13,162 | 21,502
Securities sold, not yet purchased | 3,591 | 4,436
Foreign currency exchange forward contracts |  | 1,008
Total liabilities at fair value | 16,753 | 26,946
Recurring [Member] | U.S. treasury securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 8,485 | 7,350
Recurring [Member] | Debt securities issued by U.S. federal agencies [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 5,046 | 3,360
Recurring [Member] | Corporate debt securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 17,094 | 18,085
Recurring [Member] | Asset-backed securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 2,695 | 1,897
Recurring [Member] | Collateralized mortgage obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 1,010 | 1,752
Recurring [Member] | Debt Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 34,330 | 32,444
Recurring [Member] | Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 22,744 | 24,118
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 31,229 | 31,468
Trading securities | 52,629 | 64,124
Total assets at fair value | 83,858 | 95,592
Securities sold, not yet purchased | 3,591 | 4,436
Total liabilities at fair value | 3,591 | 4,436
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | U.S. treasury securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 8,485 | 7,350
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Debt Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 8,485 | 7,350
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 22,744 | 24,118
Recurring [Member] | Significant Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 25,845 | 25,094
Warehouse receivables | 1,276,047 | 1,767,107
Foreign currency exchange forward contracts | 1,471 | 9,236
Total assets at fair value | 1,303,363 | 1,801,437
Interest rate swaps | 13,162 | 21,502
Foreign currency exchange forward contracts |  | 1,008
Total liabilities at fair value | 13,162 | 22,510
Recurring [Member] | Significant Observable Inputs (Level 2) [Member] | Debt securities issued by U.S. federal agencies [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 5,046 | 3,360
Recurring [Member] | Significant Observable Inputs (Level 2) [Member] | Corporate debt securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 17,094 | 18,085
Recurring [Member] | Significant Observable Inputs (Level 2) [Member] | Asset-backed securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 2,695 | 1,897
Recurring [Member] | Significant Observable Inputs (Level 2) [Member] | Collateralized mortgage obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 1,010 | 1,752
Recurring [Member] | Significant Observable Inputs (Level 2) [Member] | Debt Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | $ 25,845 | 25,094
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loan commitments |  | 1,680
Total assets at fair value |  | $ 1,680

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