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Acquisitions and Disposals - Proforma Consolidated Income Statement Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition, Pro Forma Information [Abstract]    
Net Service Revenue $ 936,621 $ 907,941
Operating income 71,977 64,547
Net income $ 37,521 $ 31,217
Business Acquisition, Pro Forma Earnings Per Share, Diluted $ 2.12 $ 1.78
Business Acquisition, Pro Forma Earnings Per Share, Basic $ 2.14 $ 1.79