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Stockholders' Equity - Summary of Dividend Distributions (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Class of Stock [Line Items] |  |  |  |  |
Total Common Dividend/ Distribution | $ 38,862 |  |  |  |
Total Preferred Dividend/ Distribution | 8,733 |  | 18,947 |  | 19,565
Common Class A [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Total Common Dividend/ Distribution | 38,862 | [1] | 0 | [1] | 0
Series F Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Total Preferred Dividend/ Distribution | 2,896 | [1] | 2,728 | [1] | 3,256
Series G Preferred Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Total Preferred Dividend/ Distribution | 1,809 | [1] | 1,809 | [1] | 1,809
Series J Preferred Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Total Preferred Dividend/ Distribution | 2,034 | [1] | 10,785 | [1] | 10,875
Series K Preferred Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Total Preferred Dividend/ Distribution | $ 1,994 | [1] | $ 3,625 | [1] | $ 3,625
[1] | The second quarter 2013 and fourth quarter 2012 dividend per share related to redeemed Series J Preferred Stock was pro-rated as discussed in the "Preferred Stock" section. The third quarter 2013 dividend per share related to redeemed Series K Preferred Stock was pro-rated as discussed in the "Preferred Stock" section.

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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + 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 preferred stock dividends declared with the form of settlement in cash. + 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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