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Fair Value Measurements - Fair Value of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Warehouse receivables | $ 1,642,394 | $ 1,767,107
Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 58,190 | 56,562
Trading securities | 66,707 | 64,124
Warehouse receivables | 1,642,394 | 1,767,107
Loan commitments |  | 1,680
Foreign currency exchange forward contracts | 9,427 | 9,236
Total assets at fair value | 1,776,718 | 1,898,709
Interest rate swaps | 18,873 | 21,502
Securities sold, not yet purchased | 3,123 | 4,436
Foreign currency exchange forward contracts | 4,841 | 1,008
Total liabilities at fair value | 26,837 | 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 | 8,381 | 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 | 5,409 | 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 | 17,191 | 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 | 2,900 | 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 | 1,044 | 1,752
Recurring [Member] | Debt Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 34,925 | 32,444
Recurring [Member] | Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 23,265 | 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 | 31,646 | 31,468
Trading securities | 66,707 | 64,124
Total assets at fair value | 98,353 | 95,592
Securities sold, not yet purchased | 3,123 | 4,436
Total liabilities at fair value | 3,123 | 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 | 8,381 | 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 | 8,381 | 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 | 23,265 | 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 | 26,544 | 25,094
Warehouse receivables | 1,642,394 | 1,767,107
Foreign currency exchange forward contracts | 9,427 | 9,236
Total assets at fair value | 1,678,365 | 1,801,437
Interest rate swaps | 18,873 | 21,502
Foreign currency exchange forward contracts | 4,841 | 1,008
Total liabilities at fair value | 23,714 | 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 | 5,409 | 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 | 17,191 | 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 | 2,900 | 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 | 1,044 | 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 | $ 26,544 | 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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