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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, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Warehouse receivables | $ 1,598,021 | $ 928,038
Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities | 47,905 | 34,687
Equity securities | 148,778 | 133,595
Warehouse receivables | 1,598,021 | 928,038
Total assets at fair value | 1,794,704 | 1,096,320
Interest rate swaps | 1,370 | 4,766
Securities sold, not yet purchased | 3,529 | 3,431
Total liabilities at fair value | 4,899 | 8,252
Foreign currency exchange forward contracts |  | 55
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 debt securities | 3,650 | 3,820
Equity securities | 148,778 | 133,595
Total assets at fair value | 152,428 | 137,415
Securities sold, not yet purchased | 3,529 | 3,431
Total liabilities at fair value | 3,529 | 3,431
Recurring [Member] | Significant Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities | 44,255 | 30,867
Warehouse receivables | 1,598,021 | 928,038
Total assets at fair value | 1,642,276 | 958,905
Interest rate swaps | 1,370 | 4,766
Total liabilities at fair value | 1,370 | 4,821
Foreign currency exchange forward contracts |  | 55
Recurring [Member] | U.S. treasury securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities | 3,650 | 3,820
Recurring [Member] | U.S. treasury securities [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 debt securities | 3,650 | 3,820
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 debt securities | 10,459 | 4,901
Recurring [Member] | Debt securities issued by U.S. federal agencies [Member] | Significant Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities | 10,459 | 4,901
Recurring [Member] | Corporate debt securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities | 26,846 | 20,023
Recurring [Member] | Corporate debt securities [Member] | Significant Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities | 26,846 | 20,023
Recurring [Member] | Asset-backed securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities | 4,694 | 3,577
Recurring [Member] | Asset-backed securities [Member] | Significant Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities | 4,694 | 3,577
Recurring [Member] | Collateralized mortgage obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities | 2,256 | 2,366
Recurring [Member] | Collateralized mortgage obligations [Member] | Significant Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities | $ 2,256 | $ 2,366

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- Definition Reflects the gross carrying amount of unpaid loans pertaining to a revolving line of credit used by mortgage bankers in which the mortgage banker originates and purchases mortgage loans due within one year or the normal operating cycle, if longer. + References No definition available. + Details
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