Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
Computations of Basic and Diluted Earnings Per Share (Parenthetical) (Detail) - shares
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share [Abstract]    
Weighted average shares of participating unvested restricted stock 556 559