Quarterly report pursuant to Section 13 or 15(d)

Income (Loss) Per Share - Additional Information (Detail)

v3.5.0.2
Income (Loss) Per Share - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Potentially dilutive shares included in the computation of basic and diluted earnings per share 66,668 492,600 66,668 492,600
Contingent Consideration, Liability $ 5.4 $ 9.1 $ 5.4 $ 9.1
Contingent Consideration Cash Payments $ 1.6 $ 6.9 $ 1.6 $ 6.9
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Antidilutive number of options outstanding     27,828 31,483
Average exercise price $ 44.76 $ 43.64 $ 44.76 $ 43.64