Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Shares Used in Computation of Basic and Diluted Per Share Information (Detail)

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Summary of Significant Accounting Policies - Shares Used in Computation of Basic and Diluted Per Share Information (Detail) - shares
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Weighted average shares outstanding:                      
Weighted average number of shares outstanding for basic per share calculation (in shares) 30,977,812 30,970,589 30,960,468 30,837,290 30,777,556 30,750,227 30,497,501 17,789,863 30,932,607 27,498,351 17,715,992
Effect of dilutive potential shares:                      
Nonvested restricted stock (in shares)                 277,217 275,045 245,026
Adjusted weighted average shares for diluted per share calculation (in shares) 31,270,149 31,247,196 31,200,930 31,187,098 31,142,061 31,083,815 30,742,293 18,039,345 31,209,824 27,773,396 17,961,018
Antidilutive shares (in shares)                 157,608 46,002 0