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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
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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

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- 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 + Details
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