Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.3
Summary of Changes in Stockholders Equity (Parenthetical) (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Equity [Abstract]                
Cumulative effect of change in accounting principle, taxes     $ 6,054     $ 13,079    
Dividends paid to stockholders, per share $ 0.34 $ 0.34 $ 0.34 $ 0.32 $ 0.32 $ 0.32    
Declaration Date Aug. 15, 2019 May 23, 2019 Feb. 22, 2019 Aug. 23, 2018 May 25, 2018 Feb. 23, 2018    
Record Date Sep. 04, 2019 Jun. 08, 2019 Mar. 08, 2019 Sep. 04, 2018 Jun. 08, 2018 Mar. 08, 2018    
Payable Date Sep. 18, 2019 Jun. 24, 2019 Mar. 22, 2019 Sep. 18, 2018 Jun. 22, 2018 Mar. 22, 2018    
Amount per Share of Common Stock $ 0.34 $ 0.34 $ 0.34 $ 0.32 $ 0.32 $ 0.32 $ 1.02 $ 0.96
Total $ 40,021 $ 40,012 $ 39,905 $ 37,530 $ 37,523 $ 37,471 $ 119,938 $ 112,524