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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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