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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, 2021
Dec. 31, 2020
Debt securities:    
Investments in unconsolidated subsidiaries, at fair value $ 309,749 $ 116,314
Warehouse receivables 686,317 1,411,170
Recurring    
Debt securities:    
Available for sale debt securities 72,278 73,900
Equity securities 44,592 43,334
Investments in unconsolidated subsidiaries, at fair value 216,939 50,000
Warehouse receivables 686,317 1,411,170
Total assets at fair value 1,020,126 1,578,404
Recurring | Level 1    
Debt securities:    
Available for sale debt securities 7,115 7,270
Equity securities 44,592 43,334
Investments in unconsolidated subsidiaries, at fair value 0 0
Warehouse receivables 0 0
Total assets at fair value 51,707 50,604
Recurring | Level 2    
Debt securities:    
Available for sale debt securities 65,163 66,630
Equity securities 0 0
Investments in unconsolidated subsidiaries, at fair value 0 0
Warehouse receivables 686,317 1,411,170
Total assets at fair value 751,480 1,477,800
Recurring | Level 3    
Debt securities:    
Available for sale debt securities 0 0
Equity securities 0 0
Investments in unconsolidated subsidiaries, at fair value 216,939 50,000
Warehouse receivables 0 0
Total assets at fair value 216,939 50,000
Recurring | U.S. treasury securities    
Debt securities:    
Available for sale debt securities 7,115 7,270
Recurring | U.S. treasury securities | Level 1    
Debt securities:    
Available for sale debt securities 7,115 7,270
Recurring | U.S. treasury securities | Level 2    
Debt securities:    
Available for sale debt securities 0 0
Recurring | U.S. treasury securities | Level 3    
Debt securities:    
Available for sale debt securities 0 0
Recurring | Debt securities issued by U.S. federal agencies    
Debt securities:    
Available for sale debt securities 9,489 10,216
Recurring | Debt securities issued by U.S. federal agencies | Level 1    
Debt securities:    
Available for sale debt securities 0 0
Recurring | Debt securities issued by U.S. federal agencies | Level 2    
Debt securities:    
Available for sale debt securities 9,489 10,216
Recurring | Debt securities issued by U.S. federal agencies | Level 3    
Debt securities:    
Available for sale debt securities 0 0
Recurring | Corporate debt securities    
Debt securities:    
Available for sale debt securities 50,514 51,244
Recurring | Corporate debt securities | Level 1    
Debt securities:    
Available for sale debt securities 0 0
Recurring | Corporate debt securities | Level 2    
Debt securities:    
Available for sale debt securities 50,514 51,244
Recurring | Corporate debt securities | Level 3    
Debt securities:    
Available for sale debt securities 0 0
Recurring | Asset-backed securities    
Debt securities:    
Available for sale debt securities 3,791 3,801
Recurring | Asset-backed securities | Level 1    
Debt securities:    
Available for sale debt securities 0 0
Recurring | Asset-backed securities | Level 2    
Debt securities:    
Available for sale debt securities 3,791 3,801
Recurring | Asset-backed securities | Level 3    
Debt securities:    
Available for sale debt securities 0 0
Recurring | Collateralized mortgage obligations    
Debt securities:    
Available for sale debt securities 1,369 1,369
Recurring | Collateralized mortgage obligations | Level 1    
Debt securities:    
Available for sale debt securities 0 0
Recurring | Collateralized mortgage obligations | Level 2    
Debt securities:    
Available for sale debt securities 1,369 1,369
Recurring | Collateralized mortgage obligations | Level 3    
Debt securities:    
Available for sale debt securities $ 0 $ 0