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Discontinued Operations - Supplemental Disclosure of Discontinued Operation (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Loss from discontinued operations, net of income taxes $ (25.8)
LifeWorks [Member]  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Net revenues 28.3
Loss from operations before income taxes (0.9)
Income tax expense (24.9)
Loss from discontinued operations, net of income taxes (25.8)
Loss attributable to noncontrolling interest (0.5)
Depreciation and amortization $ 1.4