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Summary of Changes in Stockholders Equity (Parenthetical) (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
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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

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