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Stockholders' Equity - Summary of Dividends Declared on its Outstanding Shares of Common Stock to its Shareholders (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends per share declared on outstanding common stock | $ 0.25us-gaap_CommonStockDividendsPerShareDeclared | $ 0.10us-gaap_CommonStockDividendsPerShareDeclared | $ 0.10us-gaap_CommonStockDividendsPerShareDeclared | $ 0.10us-gaap_CommonStockDividendsPerShareDeclared | $ 0.23us-gaap_CommonStockDividendsPerShareDeclared | $ 0.10us-gaap_CommonStockDividendsPerShareDeclared | $ 0.08us-gaap_CommonStockDividendsPerShareDeclared | $ 0.08us-gaap_CommonStockDividendsPerShareDeclared | $ 0.20us-gaap_CommonStockDividendsPerShareDeclared | $ 0.08us-gaap_CommonStockDividendsPerShareDeclared | $ 0.08us-gaap_CommonStockDividendsPerShareDeclared | $ 0.10us-gaap_CommonStockDividendsPerShareDeclared | $ 0.55us-gaap_CommonStockDividendsPerShareDeclared | $ 0.49us-gaap_CommonStockDividendsPerShareDeclared | $ 0.46us-gaap_CommonStockDividendsPerShareDeclared
Aggregate amount | $ 8,845us-gaap_DividendsCash | $ 3,429us-gaap_DividendsCash | $ 3,502us-gaap_DividendsCash | $ 3,464us-gaap_DividendsCash | $ 8,134us-gaap_DividendsCash | $ 3,511us-gaap_DividendsCash | $ 2,821us-gaap_DividendsCash | $ 3,259us-gaap_DividendsCash | $ 8,174us-gaap_DividendsCash | $ 3,270us-gaap_DividendsCash | $ 3,214us-gaap_DividendsCash | $ 4,012us-gaap_DividendsCash | $ 19,253us-gaap_DividendsCash | $ 17,754us-gaap_DividendsCash | $ 18,956us-gaap_DividendsCash

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 3: 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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- Details
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