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Stockholders' Equity - Summary of Dividend Distributions (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Class of Stock [Line Items] |  |  |
Dividend/ Distribution per Share/ Unit | $ 0.00 | $ 0.00 | $ 0.00
Total Dividend/ Distribution | $ 18,947 | $ 19,565 | $ 19,677
Common Class A [Member] |  |  |
Class of Stock [Line Items] |  |  |
Dividend/ Distribution per Share/ Unit | $ 0.0000 | $ 0.0000 | $ 0.0000
Total Dividend/ Distribution |  |  |
Series F Preferred Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Dividend/ Distribution per Share/ Unit | $ 5,455.88910 | $ 6,510.90280 | $ 6,736.15400
Total Dividend/ Distribution | 2,728 | 3,256 | 3,368
Series G Preferred Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Dividend/ Distribution per Share/ Unit | $ 7,236.00000 | $ 7,236.00000 | $ 7,236.00000
Total Dividend/ Distribution | 1,809 | 1,809 | 1,809
Series J Preferred Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Dividend/ Distribution per Share/ Unit | $ 18,125.20000 | $ 18,125.20000 | $ 18,125.20000
Total Dividend/ Distribution | 10,785 | 10,875 | 10,875
Series K Preferred Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Dividend/ Distribution per Share/ Unit | $ 18,125.20000 | $ 18,125.20000 | $ 18,125.20000
Total Dividend/ Distribution | $ 3,625 | $ 3,625 | $ 3,625

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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=6959260&loc=d3e187085-122770 + Details
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- Definition Equity impact of common stock cash dividends declared by an entity during the period. This element includes paid and unpaid dividends declared during the period. + 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 Equity impact of preferred stock cash dividends declared by an entity during the period. This element includes paid and unpaid dividends declared during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 14 -Subparagraph l -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: 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 Reference 4: 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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