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Acquisitions - Pro Forma Condensed Consolidated Income Statement (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition Pro Forma Information [Abstract]    
Net service revenue $ 1,327.3 $ 1,247.6
Operating (loss) income (7.9) 21.0
Net (loss) income $ 0.2 $ 10.9
Basic (loss) earnings per share $ 0.01 $ 0.34
Diluted (loss) earnings per share $ 0.01 $ 0.33