Quarterly report pursuant to Section 13 or 15(d)

Summary of Changes in Stockholders Equity (Parenthetical) (Detail)

v3.20.2
Summary of Changes in Stockholders Equity (Parenthetical) (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Shareholders Equity [Line Items]          
Dividends paid to stockholders, per share $ 0.36 $ 0.34 $ 0.34    
Cumulative effect of change in accounting principle, taxes     $ 6,054    
Amount per Share of Common Stock       $ 0.36 $ 0.68
Total       $ 42,567 $ 79,917
First Quarter Dividend          
Shareholders Equity [Line Items]          
Declaration Date       Feb. 21, 2020 Feb. 22, 2019
Record Date       Mar. 06, 2020 Mar. 08, 2019
Payable Date       Mar. 20, 2020 Mar. 22, 2019
Amount per Share of Common Stock       $ 0.36 $ 0.34
Total       $ 42,567 $ 39,905
Second Quarter Dividend          
Shareholders Equity [Line Items]          
Declaration Date         May 23, 2019
Record Date         Jun. 08, 2019
Payable Date         Jun. 24, 2019
Amount per Share of Common Stock         $ 0.34
Total         $ 40,012