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Fair Value Measurements - Fair Value of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Assets    
Investments in unconsolidated subsidiaries $ 361,143 $ 116,314
Warehouse receivables 1,117,677 1,411,170
Recurring    
Assets    
Available for sale debt securities 72,052 73,900
Equity securities 45,395 43,334
Investments in unconsolidated subsidiaries 265,531 50,000
Warehouse receivables 1,117,677 1,411,170
Total assets at fair value 1,500,655 1,578,404
Liabilities    
Warrant liabilities 10,868  
Total liabilities at fair value 10,868  
Recurring | Level 1    
Assets    
Available for sale debt securities 7,094 7,270
Equity securities 45,395 43,334
Investments in unconsolidated subsidiaries 0 0
Warehouse receivables 0 0
Total assets at fair value 52,489 50,604
Liabilities    
Warrant liabilities 10,868  
Total liabilities at fair value 10,868  
Recurring | Level 2    
Assets    
Available for sale debt securities 64,958 66,630
Equity securities 0 0
Investments in unconsolidated subsidiaries 0 0
Warehouse receivables 1,117,677 1,411,170
Total assets at fair value 1,182,635 1,477,800
Liabilities    
Warrant liabilities  
Total liabilities at fair value 0  
Recurring | Level 3    
Assets    
Available for sale debt securities 0 0
Equity securities 0 0
Investments in unconsolidated subsidiaries 265,531 50,000
Warehouse receivables 0 0
Total assets at fair value 265,531 50,000
Liabilities    
Warrant liabilities 0  
Total liabilities at fair value 0  
Recurring | U.S. treasury securities    
Assets    
Available for sale debt securities 7,094 7,270
Recurring | U.S. treasury securities | Level 1    
Assets    
Available for sale debt securities 7,094 7,270
Recurring | U.S. treasury securities | Level 2    
Assets    
Available for sale debt securities 0 0
Recurring | U.S. treasury securities | Level 3    
Assets    
Available for sale debt securities 0 0
Recurring | Debt securities issued by U.S. federal agencies    
Assets    
Available for sale debt securities 8,689 10,216
Recurring | Debt securities issued by U.S. federal agencies | Level 1    
Assets    
Available for sale debt securities 0 0
Recurring | Debt securities issued by U.S. federal agencies | Level 2    
Assets    
Available for sale debt securities 8,689 10,216
Recurring | Debt securities issued by U.S. federal agencies | Level 3    
Assets    
Available for sale debt securities 0 0
Recurring | Corporate debt securities    
Assets    
Available for sale debt securities 51,177 51,244
Recurring | Corporate debt securities | Level 1    
Assets    
Available for sale debt securities 0 0
Recurring | Corporate debt securities | Level 2    
Assets    
Available for sale debt securities 51,177 51,244
Recurring | Corporate debt securities | Level 3    
Assets    
Available for sale debt securities 0 0
Recurring | Asset-backed securities    
Assets    
Available for sale debt securities 3,778 3,801
Recurring | Asset-backed securities | Level 1    
Assets    
Available for sale debt securities 0 0
Recurring | Asset-backed securities | Level 2    
Assets    
Available for sale debt securities 3,778 3,801
Recurring | Asset-backed securities | Level 3    
Assets    
Available for sale debt securities 0 0
Recurring | Collateralized mortgage obligations    
Assets    
Available for sale debt securities 1,314 1,369
Recurring | Collateralized mortgage obligations | Level 1    
Assets    
Available for sale debt securities 0 0
Recurring | Collateralized mortgage obligations | Level 2    
Assets    
Available for sale debt securities 1,314 1,369
Recurring | Collateralized mortgage obligations | Level 3    
Assets    
Available for sale debt securities $ 0 $ 0