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Dividends (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Dividend Declared [Line Items] |  |  |  |
Amount per Share of Common Stock | [1] | $ 1.28 | $ 1.16 | $ 1.08
Total Dividends | [2] | $ 150,116 | $ 135,637 | $ 126,044
First Quarter Dividend |  |  |  |
Dividend Declared [Line Items] |  |  |  |
Declaration Date |  | Feb. 23, 2018 | Feb. 23, 2017 | Feb. 24, 2016
Record Date |  | Mar. 08, 2018 | Mar. 08, 2017 | Mar. 07, 2016
Payable Date |  | Mar. 22, 2018 | Mar. 20, 2017 | Mar. 18, 2016
Amount per Share of Common Stock | [1] | $ 0.32 | $ 0.29 | $ 0.27
Total Dividends | [2] | $ 37,471 | $ 33,912 | $ 31,544
Second Quarter Dividend |  |  |  |
Dividend Declared [Line Items] |  |  |  |
Declaration Date |  | May 25, 2018 | May 25, 2017 | May 26, 2016
Record Date |  | Jun. 08, 2018 | Jun. 08, 2017 | Jun. 08, 2016
Payable Date |  | Jun. 22, 2018 | Jun. 22, 2017 | Jun. 22, 2016
Amount per Share of Common Stock | [1] | $ 0.32 | $ 0.29 | $ 0.27
Total Dividends | [2] | $ 37,523 | $ 33,904 | $ 31,459
Third Quarter Dividend |  |  |  |
Dividend Declared [Line Items] |  |  |  |
Declaration Date |  | Aug. 23, 2018 | Aug. 10, 2017 | Aug. 18, 2016
Record Date |  | Sep. 04, 2018 | Aug. 31, 2017 | Aug. 31, 2016
Payable Date |  | Sep. 18, 2018 | Sep. 13, 2017 | Sep. 13, 2016
Amount per Share of Common Stock | [1] | $ 0.32 | $ 0.29 | $ 0.27
Total Dividends | [2] | $ 37,530 | $ 33,911 | $ 31,473
Fourth Quarter Dividend |  |  |  |
Dividend Declared [Line Items] |  |  |  |
Declaration Date |  | Nov. 15, 2018 | Nov. 17, 2017 | Nov. 16, 2016
Record Date |  | Dec. 04, 2018 | Dec. 01, 2017 | Dec. 02, 2016
Payable Date |  | Dec. 18, 2018 | Dec. 15, 2017 | Dec. 16, 2016
Amount per Share of Common Stock | [1] | $ 0.32 | $ 0.29 | $ 0.27
Total Dividends | [2] | $ 37,592 | $ 33,910 | $ 31,568
[1] | Beginning with the dividend declared on February 24, 2016, the Company’s board of directors raised the quarterly dividend to $0.27 per common share. Beginning with the dividend declared on February 23, 2017, the Company’s board of directors raised the quarterly dividend to $0.29 per common share. Beginning with the dividend declared on February 23, 2018, the Company’s board of directors raised the quarterly dividend to $0.32 per common share.
[2] | Of the dividends recorded during 2016, 2017 and 2018, $554, $558 and $624, respectively, were related to outstanding restricted stock units and will not be paid until such units vest. See Note 15.

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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). + 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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