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Dividends (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Dividend Declared [Line Items] |  |  |
Amount per Share of Common Stock |  | $ 0.36 | $ 1.36
Total Dividends | [1] | $ 42,567 | $ 159,951
First Quarter Dividend |  |  |
Dividend Declared [Line Items] |  |  |
Declaration Date |  | Feb. 21, 2020 | Feb. 23, 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 Dividends | [1] | $ 42,567 | $ 39,905
Second Quarter Dividend |  |  |
Dividend Declared [Line Items] |  |  |
Declaration Date |  |  | May 24, 2019
Record Date |  |  | Jun. 10, 2019
Payable Date |  |  | Jun. 24, 2019
Amount per Share of Common Stock |  |  | $ 0.34
Total Dividends | [1] |  | $ 40,012
Third Quarter Dividend |  |  |
Dividend Declared [Line Items] |  |  |
Declaration Date |  |  | Aug. 16, 2019
Record Date |  |  | Sep. 04, 2019
Payable Date |  |  | Sep. 18, 2019
Amount per Share of Common Stock |  |  | $ 0.34
Total Dividends | [1] |  | $ 40,020
Fourth Quarter Dividend |  |  |
Dividend Declared [Line Items] |  |  |
Declaration Date |  |  | Nov. 22, 2019
Record Date |  |  | Dec. 04, 2019
Payable Date |  |  | Dec. 18, 2019
Amount per Share of Common Stock |  |  | $ 0.34
Total Dividends | [1] |  | $ 40,014
[1] | Of the dividends recorded during 2019, 2020 and 2021, $670, $256 and $(4), respectively, were related to outstanding restricted stock units and will not be paid until such units vest. See Note 17.

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