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Stockholders' Equity - Summary of Dividends Declared on its Outstanding Shares of Common Stock to its Shareholders (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends per share declared on outstanding common stock | $ 0.27 | $ 0.14 | $ 0.14 | $ 0.14 | $ 0.27 | $ 0.14 | $ 0.14 | $ 0.14 | $ 0.27 | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.69 | $ 0.69 | $ 0.63
Aggregate amount | $ 9,392 | $ 4,830 | $ 4,887 | $ 4,932 | $ 9,461 | $ 4,903 | $ 4,913 | $ 4,915 | $ 9,492 | $ 4,275 | $ 4,283 | $ 4,237 | $ 24,051 | $ 24,202 | $ 22,297

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 dividends declared for classes of stock, for example, but not limited to, common and preferred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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