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Derivatives - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Dec. 31, 2017
Derivative Instruments And Hedging Activities Disclosure [Abstract] |  |
Change in fair value of rate lock commitments, net | $ 2.5 | $ 0.8

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- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 + Details
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