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Dividends (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Dividend Declared [Line Items] |  |  |  |
Amount per Share of Common Stock |  | $ 1.36 | $ 1.28 | $ 1.16
Total Dividends | [1] | $ 159,951 | $ 150,116 | $ 135,637
First Quarter Dividend |  |  |  |
Dividend Declared [Line Items] |  |  |  |
Declaration Date |  | Feb. 23, 2019 | Feb. 23, 2018 | Feb. 23, 2017
Record Date |  | Mar. 08, 2019 | Mar. 08, 2018 | Mar. 08, 2017
Payable Date |  | Mar. 22, 2019 | Mar. 22, 2018 | Mar. 20, 2017
Amount per Share of Common Stock |  | $ 0.34 | $ 0.32 | $ 0.29
Total Dividends | [1] | $ 39,905 | $ 37,471 | $ 33,912
Second Quarter Dividend |  |  |  |
Dividend Declared [Line Items] |  |  |  |
Declaration Date |  | May 24, 2019 | May 25, 2018 | May 25, 2017
Record Date |  | Jun. 10, 2019 | Jun. 08, 2018 | Jun. 08, 2017
Payable Date |  | Jun. 24, 2019 | Jun. 22, 2018 | Jun. 22, 2017
Amount per Share of Common Stock |  | $ 0.34 | $ 0.32 | $ 0.29
Total Dividends | [1] | $ 40,012 | $ 37,523 | $ 33,904
Third Quarter Dividend |  |  |  |
Dividend Declared [Line Items] |  |  |  |
Declaration Date |  | Aug. 16, 2019 | Aug. 23, 2018 | Aug. 10, 2017
Record Date |  | Sep. 04, 2019 | Sep. 04, 2018 | Aug. 31, 2017
Payable Date |  | Sep. 18, 2019 | Sep. 18, 2018 | Sep. 13, 2017
Amount per Share of Common Stock |  | $ 0.34 | $ 0.32 | $ 0.29
Total Dividends | [1] | $ 40,020 | $ 37,530 | $ 33,911
Fourth Quarter Dividend |  |  |  |
Dividend Declared [Line Items] |  |  |  |
Declaration Date |  | Nov. 22, 2019 | Nov. 15, 2018 | Nov. 17, 2017
Record Date |  | Dec. 04, 2019 | Dec. 04, 2018 | Dec. 01, 2017
Payable Date |  | Dec. 18, 2019 | Dec. 18, 2018 | Dec. 15, 2017
Amount per Share of Common Stock |  | $ 0.34 | $ 0.32 | $ 0.29
Total Dividends | [1] | $ 40,014 | $ 37,592 | $ 33,910
[1] | Of the dividends recorded during 2017, 2018 and 2019, $558, $624 and $670, respectively, were related to outstanding restricted stock units and will not be paid until such units vest. See Note 16.

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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