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Fair Value Measurements - Fair Value of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Warehouse receivables $ 1,548,249 $ 1,342,468
Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 48,531 48,776
Equity securities 210,160 153,762
Warehouse receivables 1,548,249 1,342,468
Total assets at fair value 1,806,940 1,545,006
Interest rate swaps 736 1,070
Securities sold, not yet purchased 4,189 3,133
Total liabilities at fair value 4,925 4,203
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 3,189 3,138
Equity securities 210,160 153,762
Total assets at fair value 213,349 156,900
Securities sold, not yet purchased 4,189 3,133
Total liabilities at fair value 4,189 3,133
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 45,342 45,638
Warehouse receivables 1,548,249 1,342,468
Total assets at fair value 1,593,591 1,388,106
Interest rate swaps 736 1,070
Total liabilities at fair value 736 1,070
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 3,189 3,138
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 3,189 3,138
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 11,167 11,196
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 11,167 11,196
Recurring [Member] | Corporate debt securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 27,041 27,201
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 27,041 27,201
Recurring [Member] | Asset-backed securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 4,897 5,017
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 4,897 5,017
Recurring [Member] | Collateralized mortgage obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 2,237 2,224
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 $ 2,237 $ 2,224