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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

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