Annual report pursuant to Section 13 and 15(d)

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

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Computations of Basic and Diluted Earnings Per Share (Parenthetical) (Detail) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share Disclosure [Line Items]      
Weighted average shares of participating unvested restricted stock 815,000 721,000 640,000
Restricted Stock Units (RSUs)      
Earnings Per Share Disclosure [Line Items]      
Common equivalent shares for restricted stock units 682,000 300,000 [1] 288,000 [1]
[1]

For the year ended December 31, 2020, approximately 682 common equivalent shares for restricted stock units were excluded because they were anti-dilutive.