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Earnings Per Share - Additional Information (Detail) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Performance-Based Restricted Stock Awards and Options to Purchase Common Stock [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Outstanding awards and options not included in diluted earnings per share 792,149 945,725 872,039 1,193,425
Common Stock Equivalents [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Outstanding awards and options not included in diluted earnings per share     209,269