Acquisitions - Pro Forma Condensed Consolidated Income Statement (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Business Acquisition Pro Forma Information [Abstract]
Net service revenue	$ 1,449.7	$ 1,322.2
Operating income (loss)	53.9	(7.8)
Net income (loss)	$ 35.0	$ 0.4
Basic earnings (loss) per share	$ 1.04	$ (0.01)
Diluted earnings (loss) per share	$ 1.03	$ (0.01)

No definition available.

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- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463

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- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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- References

No definition available.

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- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

+ Details

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- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

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