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Earnings Per Share - Additional Information (Detail) - shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Diluted earnings per share excludes antidilutive effect   0 0
Stock Options [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Diluted earnings per share excludes antidilutive effect 1,400,000    
Performance Based Restricted Stock [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Diluted earnings per share excludes antidilutive effect 200,000 500,000 300,000