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Discontinued Operations - Supplemental Disclosure of Discontinued Operation (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Net revenues       $ 0.0
Income (loss) from operations before income taxes       (0.1)
Gain on sale of businesses       0.9
Income tax expense       (0.3)
(Loss) income from discontinued operations, net of income taxes $ (9.7) $ 0.2 $ (11.8) 0.5
LifeWorks [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Net revenues 6.6 19.3 28.3 38.9
Income (loss) from operations before income taxes   0.2 (0.9) 1.5
Income tax expense (9.7)   (10.9) (1.5)
(Loss) income from discontinued operations, net of income taxes (9.7) 0.2 (11.8)  
Depreciation and amortization $ 0.4 1.0 $ 1.4 2.0
Capital expenditures   $ 0.1   $ 0.2