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Fair Value of Financial Assets and Liabilities - Changes in Level 3 Nasdaq Forwards, Rate Lock Commitments, Forwards and Contingent Consideration Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Assets, Opening Balance	$ 80,464	$ 18,437	$ 92,528	$ 6,676
Assets, Total realized and unrealized gains (losses) included in Net income	9,158	28,082	(4,171)	28,082
Assets, Issuances		21,893		21,893
Assets, Settlements	(16,174)	(18,437)	(14,909)	(6,676)
Assets, Closing Balance	73,448	49,975	73,448	49,975
Assets, Unrealized gains (losses) outstanding	9,158	28,082	(4,171)	28,082
Liabilities, Opening Balance	46,143	34,489	49,230	26,757
Liabilities, Total realized and unrealized gains (losses) included in Net income	29,624	14,881	31,008	15,018
Liabilities, Issuances	7,758	688	7,758	688
Liabilities, Settlements	(15,124)	(13,898)	(19,595)	(6,303)
Liabilities, Closing Balance	68,401	36,160	68,401	36,160
Liabilities, Unrealized gains (losses) outstanding	29,624	14,881	31,008	15,018
Rate Lock Commitments [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Assets, Opening Balance	10,210	8,750	6,732	2,923
Assets, Total realized and unrealized gains (losses) included in Net income	21,951	14,448	21,951	14,448
Assets, Settlements	(10,210)	(8,750)	(6,732)	(2,923)
Assets, Closing Balance	21,951	14,448	21,951	14,448
Assets, Unrealized gains (losses) outstanding	21,951	14,448	21,951	14,448
Liabilities, Opening Balance	5,190	8,980	7,470	2,390
Liabilities, Total realized and unrealized gains (losses) included in Net income	2,428	13,945	2,428	13,945
Liabilities, Settlements	(5,190)	(8,980)	(7,470)	(2,390)
Liabilities, Closing Balance	2,428	13,945	2,428	13,945
Liabilities, Unrealized gains (losses) outstanding	2,428	13,945	2,428	13,945
Forward Sale Contracts [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Assets, Opening Balance	5,964	9,687	8,177	3,753
Assets, Total realized and unrealized gains (losses) included in Net income	2,845	16,442	2,845	16,442
Assets, Settlements	(5,964)	(9,687)	(8,177)	(3,753)
Assets, Closing Balance	2,845	16,442	2,845	16,442
Assets, Unrealized gains (losses) outstanding	2,845	16,442	2,845	16,442
Liabilities, Opening Balance	9,596	2,421	9,208	657
Liabilities, Total realized and unrealized gains (losses) included in Net income	27,261	641	27,261	641
Liabilities, Settlements	(9,596)	(2,421)	(9,208)	(657)
Liabilities, Closing Balance	27,261	641	27,261	641
Liabilities, Unrealized gains (losses) outstanding	27,261	641	27,261	641
Forward Contracts [Member] | NASDAQ [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Assets, Opening Balance	64,290		77,619
Assets, Total realized and unrealized gains (losses) included in Net income	(15,638)	(2,808)	(28,967)	(2,808)
Assets, Issuances		21,893		21,893
Assets, Closing Balance	48,652	19,085	48,652	19,085
Assets, Unrealized gains (losses) outstanding	(15,638)	(2,808)	(28,967)	(2,808)
Contingent Consideration [Member] | Accounts Payable, Accrued and Other Liabilities [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Liabilities, Opening Balance	31,357	23,088	32,552	23,710
Liabilities, Total realized and unrealized gains (losses) included in Net income	(65)	295	1,319	432
Liabilities, Issuances	7,758	688	7,758	688
Liabilities, Settlements	(338)	(2,497)	(2,917)	(3,256)
Liabilities, Closing Balance	38,712	21,574	38,712	21,574
Liabilities, Unrealized gains (losses) outstanding	$ (65)	$ 295	$ 1,319	$ 432

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