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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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