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Acquisitions and Disposals - Proforma Consolidated Income Statement Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition, Pro Forma Information [Abstract]    
Net Service Revenue $ 868,075 $ 789,761
Operating income 67,520 45,671
Net income $ 33,044 $ 21,949
Business Acquisition, Pro Forma Earnings Per Share, Diluted $ 1.88 $ 1.27
Business Acquisition, Pro Forma Earnings Per Share, Basic $ 1.90 $ 1.27