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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