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Derivatives - Summary of Gains Losses on Derivative Contracts Included in Condensed Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Rate Lock Commitments [Member] | Compensation and Employee Benefits [Member]
Derivative Instruments Gain Loss [Line Items]
Gain (loss) recognized in income for derivatives	$ (200)	$ 800	$ 1,900	$ 3,300
Not Designated as Hedging Instrument [Member]
Derivative Instruments Gain Loss [Line Items]
Gain (loss) recognized in income for derivatives	(21,919)	12,077	(33,860)	19,112
Not Designated as Hedging Instrument [Member] | Rate Lock Commitments [Member] | Gains From Mortgage Banking Activities/Originations, Net [Member]
Derivative Instruments Gain Loss [Line Items]
Gain (loss) recognized in income for derivatives	14,292	1,515	21,379	3,784
Not Designated as Hedging Instrument [Member] | Rate Lock Commitments [Member] | Compensation and Employee Benefits [Member]
Derivative Instruments Gain Loss [Line Items]
Gain (loss) recognized in income for derivatives	211	(782)	(1,856)	(3,282)
Not Designated as Hedging Instrument [Member] | Nasdaq Forward [Member] | Other Income (Loss), Net [Member]
Derivative Instruments Gain Loss [Line Items]
Gain (loss) recognized in income for derivatives	(15,638)	2,808	(28,967)	2,808
Not Designated as Hedging Instrument [Member] | Forward Sale Contracts [Member] | Deliver Loans to Third-party Investors [Member] | Gains From Mortgage Banking Activities/Originations, Net [Member]
Derivative Instruments Gain Loss [Line Items]
Gain (loss) recognized in income for derivatives	$ (20,784)	$ 8,536	$ (24,416)	$ 15,802

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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