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Common Stock and Other Equity Related Transactions - Additional Information (Detail) (USD $) | 3 Months Ended
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Jun. 30, 2013 Common Stock | Mar. 31, 2013 Common Stock | Jun. 30, 2013 Cumulative Series C Six Point Seven Five Percent Redeemable Perpetual Preferred Stock [Member] | Mar. 31, 2013 Cumulative Series C Six Point Seven Five Percent Redeemable Perpetual Preferred Stock [Member] | Sep. 30, 2012 Cumulative Series C Six Point Seven Five Percent Redeemable Perpetual Preferred Stock [Member] | Sep. 30, 2013 Subsequent Event [Member]
Class of Stock [Line Items] |  |  |  |  |  |
Dividends Payable, Date to be Paid | Jul. 12, 2013 | Apr. 12, 2013 | Jul. 01, 2013 | Apr. 01, 2013 |  |
Common Stock, Dividends, Per Share, Cash Paid | $ 0.25 | $ 0.25 |  |  |  |
Preferred Stock, Dividends, Per Share, Cash Paid |  |  | $ 0.421875 |  | $ 0.421875 |
Dividends Payable, Date of Record | Jun. 28, 2013 | Mar. 28, 2013 | Jun. 20, 2013 | Mar. 21, 2013 |  |
Stockholders' Equity Note, Stock Split |  |  |  |  |  | On June 25, 2013, management announced a two-for-one split, to be effected by and in the form of a stock dividend, to take effect on July 15, 2013. On July 15, 2013, each common shareholder of record on July 5, 2013, received one additional share of common stock for each share held. On July 15, 2013, a two-for-one stock split of our common stock, effected by and in the form of a stock dividend, was paid to stockholders of record on July 5, 2013.
Stockholders' Equity Note, Stock Split, Conversion Ratio |  |  |  |  |  | 2

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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=6959260&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 Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Description of the stock split arrangement. Also provide the retroactive effect given by a stock split that occurs after the balance date but before the release of financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Stock Split -URI http://asc.fasb.org/extlink&oid=6525746 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187143-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section C Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section B -Paragraph 2, 15, 16 -Chapter 7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition This item represents the conversion ratio used in the calculation of a stock split. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Stock Split -URI http://asc.fasb.org/extlink&oid=6525746 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187143-122770 + Details
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