Annual report pursuant to Section 13 and 15(d)

Computations of Basic and Diluted Earnings Per Share (Parenthetical) (Detail)

v3.6.0.2
Computations of Basic and Diluted Earnings Per Share (Parenthetical) (Detail) - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share Disclosure [Line Items]      
Weighted average shares of participating unvested restricted stock 542 699 810