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Stockholders' Equity - Summary of Preferred Shares Outstanding (Detail) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
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Series F Preferred Stock [Member] |  |
Class of Stock [Line Items] |  |
Preferred Shares Outstanding | 500 | 500
Liquidation Preference | $ 50,000 | $ 50,000
Series G Preferred Stock [Member] |  |
Class of Stock [Line Items] |  |
Preferred Shares Outstanding | 250 | 250
Liquidation Preference | 25,000 | 25,000
Series J Preferred Stock [Member] |  |
Class of Stock [Line Items] |  |
Preferred Shares Outstanding | 400 | 600
Liquidation Preference | 100,000 | 150,000
Series K Preferred Stock [Member] |  |
Class of Stock [Line Items] |  |
Preferred Shares Outstanding | 200 | 200
Liquidation Preference | $ 50,000 | $ 50,000

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- Definition Value of the difference between preference in liquidation and the par or stated values of the preferred shares. + References No definition available. + Details
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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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