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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, 2022
Dec. 31, 2021
Assets    
Investments in unconsolidated subsidiaries $ 713,871 $ 813,031
Warehouse receivables 1,194,800 1,303,717
Recurring    
Assets    
Available for sale debt securities 68,569 71,328
Equity securities 42,488 69,880
Investments in unconsolidated subsidiaries 546,280 660,331
Warehouse receivables 1,194,800 1,303,717
Total assets at fair value 1,852,137 2,105,256
Liabilities    
Other liabilities 1,322 10,700
Total liabilities at fair value 1,322 10,700
Recurring | Level 1    
Assets    
Available for sale debt securities 6,832 7,002
Equity securities 42,488 69,880
Investments in unconsolidated subsidiaries 163,460 229,900
Warehouse receivables 0 0
Total assets at fair value 212,780 306,782
Liabilities    
Other liabilities 0 0
Total liabilities at fair value 0 0
Recurring | Level 2    
Assets    
Available for sale debt securities 61,737 64,326
Equity securities 0 0
Investments in unconsolidated subsidiaries 14,965 23,741
Warehouse receivables 1,194,800 1,303,717
Total assets at fair value 1,271,502 1,391,784
Liabilities    
Other liabilities 0 0
Total liabilities at fair value 0 0
Recurring | Level 3    
Assets    
Available for sale debt securities 0 0
Equity securities 0 0
Investments in unconsolidated subsidiaries 367,855 406,690
Warehouse receivables 0 0
Total assets at fair value 367,855 406,690
Liabilities    
Other liabilities 1,322 10,700
Total liabilities at fair value 1,322 10,700
Recurring | U.S. treasury securities    
Assets    
Available for sale debt securities 6,832 7,002
Recurring | U.S. treasury securities | Level 1    
Assets    
Available for sale debt securities 6,832 7,002
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 10,146 9,276
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 10,146 9,276
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 47,806 50,897
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 47,806 50,897
Recurring | Corporate debt securities | Level 3    
Assets    
Available for sale debt securities 0 0
Recurring | Asset-backed securities    
Assets    
Available for sale debt securities 3,193 3,428
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 3,193 3,428
Recurring | Asset-backed securities | Level 3    
Assets    
Available for sale debt securities 0 0
Recurring | Collateralized mortgage obligations    
Assets    
Available for sale debt securities 592 725
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 592 725
Recurring | Collateralized mortgage obligations | Level 3    
Assets    
Available for sale debt securities $ 0 $ 0