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Summary of Changes in Stockholders Equity (Parenthetical) (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Shareholders Equity [Line Items] |  |  |  |  |  |
Dividends paid to stockholders, per share | $ 0.36 | $ 0.34 | $ 0.34 | $ 0.34 |  |
Cumulative effect of change in accounting principle, taxes |  |  |  | $ 6,054 |  |
Amount per Share of Common Stock |  |  |  |  |  | $ 1.02
Total |  |  |  |  |  | $ 119,938
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
Third Quarter Dividend |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |
Declaration Date |  |  |  |  |  | Aug. 15, 2019
Record Date |  |  |  |  |  | Sep. 04, 2019
Payable Date |  |  |  |  |  | Sep. 18, 2019
Amount per Share of Common Stock |  |  |  |  |  | $ 0.34
Total |  |  |  |  |  | $ 40,021

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