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Common Stock and Other Equity Related Transactions - Additional Information (Detail) (USD $) | 3 Months Ended
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Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014
Cumulative Series C Six Point Seven Five Percent Redeemable Perpetual Preferred Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Dividends Payable, Date to be Paid | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014
Preferred Stock, Dividends, Per Share, Cash Paid | $ 0.421875 | $ 0.421875 | $ 0.421875
Dividends Payable, Date of Record | Sep. 19, 2014 | Jun. 20, 2014 | Mar. 21, 2014
Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Dividends Payable, Date to be Paid | Oct. 10, 2014 | Jul. 11, 2014 | Apr. 11, 2014
Common Stock, Dividends, Per Share, Cash Paid | $ 0.325 | $ 0.325 | $ 0.325
Dividends Payable, Date of Record | Sep. 26, 2014 | Jun. 27, 2014 | Mar. 28, 2014

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- Definition Aggregate dividends paid 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 Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Aggregate dividends paid during the period for each share of preferred stock outstanding. + References No definition available. + Details
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