Quarterly report pursuant to Section 13 or 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
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share Disclosure [Line Items]        
Weighted average shares of participating restricted stock 1,175,000 793,000 880,000 719,000
Restricted Stock Units (RSUs)        
Earnings Per Share Disclosure [Line Items]        
Common equivalent shares for restricted stock units 438,000 244,000 [1] 689,000 289,000 [1]
[1] For the three months ended September 30, 2020, approximately 438 common equivalent shares for restricted stock units were excluded because they were anti-dilutive.  For the nine months ended September 30, 2020, approximately 689 common equivalent shares for restricted stock units were excluded because they were anti-dilutive.