Annual report pursuant to Section 13 and 15(d)

Earnings per Share - Additional Information (Detail)

v3.3.1.900
Earnings per Share - Additional Information (Detail) - shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock option awards [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive shares 30,250 85,850 60,400