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Earnings Per Share - Additional Information (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Options to Purchase Common Stock and Performance-Based Restricted Stock Awards [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Outstanding awards and options not included in diluted earnings per share 571,601   468,286  
Common Stock Equivalents [Member] | Performance-based restricted stock [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Outstanding awards and options not included in diluted earnings per share   1,203,424   1,153,763