Supplementary Quarterly Financial Data (Unaudited) - Schedule of Quarterly Financial Data (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Dec. 31, 2019	Jun. 30, 2020
Goodwill impairment charge		$ 82.0
Immaterial Prior Period [Member] \| Selling, General, and Administrative Expenses [Member]
Goodwill impairment charge	$ 1.3

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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