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Fair Value of Financial Assets and Liabilities - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Assets, Unobservable Input Reconciliation: |  |
Opening Balance | $ 41,488 | $ 72,926
Total realized and unrealized gains (losses) included in Net income | 12,685 | 14,986
Issuances | 0 | 0
Settlements | (28,666) | (46,424)
Closing Balance | 25,507 | 41,488
Unrealized gains (losses) outstanding | 25,507 | 41,488
Liabilities, Unobservable Input Reconciliation: |  |
Opening Balance | 49,429 | 70,833
Total realized and unrealized gains (losses) included in Net income | 12,366 | 6,885
Issuances | 0 | 2,221
Settlements | (30,315) | (30,510)
Closing Balance | 31,480 | 49,429
Unrealized (gains) losses outstanding, at end of period | 31,480 | 17,540
Rate lock commitments |  |
Assets, Unobservable Input Reconciliation: |  |
Opening Balance | 21,034 | 32,035
Total realized and unrealized gains (losses) included in Net income | 9,048 | 21,034
Issuances | 0 | 0
Settlements | (21,034) | (32,035)
Closing Balance | 9,048 | 21,034
Unrealized gains (losses) outstanding | 9,048 | 21,034
Liabilities, Unobservable Input Reconciliation: |  |
Opening Balance | 2,977 | 12,124
Total realized and unrealized gains (losses) included in Net income | 5,471 | 2,977
Issuances | 0 |
Settlements | (2,977) | (12,124)
Closing Balance | 5,471 | 2,977
Unrealized (gains) losses outstanding, at end of period | 5,471 | 2,977
Contingent consideration |  |
Liabilities, Unobservable Input Reconciliation: |  |
Opening Balance | 31,481 | 45,172
Total realized and unrealized gains (losses) included in Net income | 413 | (11,063)
Issuances | 0 | 2,221
Settlements | (12,367) | (4,849)
Closing Balance | 19,527 | 31,481
Unrealized (gains) losses outstanding, at end of period | 19,527 | (408)
Forward sale contracts |  |
Assets, Unobservable Input Reconciliation: |  |
Opening Balance | 7,632 | 14,389
Total realized and unrealized gains (losses) included in Net income | 9,239 | 7,632
Issuances | 0 | 0
Settlements | (7,632) | (14,389)
Closing Balance | 9,239 | 7,632
Unrealized gains (losses) outstanding | 9,239 | 7,632
Liabilities, Unobservable Input Reconciliation: |  |
Opening Balance | 14,971 | 13,537
Total realized and unrealized gains (losses) included in Net income | 6,482 | 14,971
Issuances | 0 |
Settlements | (14,971) | (13,537)
Closing Balance | 6,482 | 14,971
Unrealized (gains) losses outstanding, at end of period | 6,482 | 14,971
Nasdaq Forwards |  |
Assets, Unobservable Input Reconciliation: |  |
Opening Balance | 12,822 | 26,502
Total realized and unrealized gains (losses) included in Net income | (5,602) | (13,680)
Issuances | 0 | 0
Settlements | 0 | 0
Closing Balance | 7,220 | 12,822
Unrealized gains (losses) outstanding | $ 7,220 | $ 12,822

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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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