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Stockholders' Equity and Noncontrolling Interest - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended | 1 Months Ended | 0 Months Ended |  | 0 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Mar. 31, 2013 Series A Cumulative Redeemable Preferred Stock | Mar. 31, 2013 9% Series B Cumulative Redeemable Preferred Stock | Mar. 31, 2013 Series A Preferred Stock | Feb. 12, 2013 6.875 Series C Cumulative Redeemable Preferred Stock | Feb. 12, 2013 6.875 Series C Cumulative Redeemable Preferred Stock | Feb. 12, 2013 6.875 Series C Cumulative Redeemable Preferred Stock Minimum | Feb. 12, 2013 6.875 Series C Cumulative Redeemable Preferred Stock Maximum
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income attributable to noncontrolling interests | $ 2,374,000 | $ 2,110,000 | $ 9,231,000 | $ 1,692,000 |  |  |  |  |  |  |
Percentage of redeemable preferred stock |  |  |  |  | 60.00% |  |  | 6.875% |  |  |
Dividend rate on preferred stock |  |  |  |  | 8.00% | 9.00% | 8.00% |  |  |  |
Outstanding depositary shares |  |  |  |  |  |  | 1.6 |  |  |  |
Depository shares to cumulative redeemable preferred stock ratio |  |  |  |  |  |  | 0.01 | 0.01 |  |  |
Cumulative redeemable preferred stock liquidation preference |  |  |  |  |  |  | $ 25.00 |  | $ 25.00 |  |
Annual dividend on depositary shares |  |  |  |  |  |  | $ 2.00 | $ 1.71875 |  |  |
Number of depositary shares sold |  |  |  |  |  |  |  | 5.6 |  |  |
Cash proceeds from sale depositary shares |  |  |  |  |  |  |  | $ 135,200,000 |  |  |
Dividend payment accrual date |  |  |  |  |  |  |  |  |  | Feb. 12, 2018 |
Dividend payment date |  |  |  |  |  |  |  | Apr. 15, 2013 |  |  |
Dividends record date |  |  |  |  |  |  |  |  |  | Feb. 12, 2013 | Mar. 31, 2013

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