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Distributions - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended
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Dec. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jan. 31, 2014 Subsequent Event | Jan. 15, 2014 Subsequent Event | Dec. 31, 2013 Dividend Income | Dec. 31, 2012 Dividend Income | Dec. 31, 2011 Dividend Income | Dec. 31, 2013 Return on Invested Capital | Dec. 31, 2012 Return on Invested Capital | Dec. 31, 2011 Return on Invested Capital | Dec. 31, 2013 Series A Preferred Stock | Dec. 31, 2013 Series A Preferred Stock | Dec. 31, 2012 Series A Preferred Stock | Dec. 31, 2011 Series A Preferred Stock | Dec. 31, 2012 Series B Preferred Stock | Dec. 31, 2013 Series B Preferred Stock | Dec. 31, 2011 Series B Preferred Stock | Dec. 31, 2013 Series C Preferred Stock | Dec. 31, 2013 Series C Preferred Stock | Dec. 31, 2013 Common Stock
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued, discount rate |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock distributions (in usd per share) |  | $ 1.44 | $ 1,440 | $ 1,440 |  |  | $ 0.9648 | $ 0.95 | $ 0.72 | $ 0.4752 | $ 0.49 | $ 0.72 |  |  |  |  |  |  |  |  |  |
Preferred stock dividend (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2 | $ 2.00 | $ 2.00 | $ 2.25 | $ 0.989 | $ 2.25 |  | $ 1.088545 |
Dividends declared per common share outstanding (in usd per share) | $ 0.36 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends record date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 17, 2014
Common stock dividend paid |  |  |  |  | $ 7,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution to limited partnership unitholders |  | 9,956 | 9,955 | 8,339 | 2,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution to limited partnership unitholders (in usd per share) |  |  |  |  | $ 0.36 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per preferred share outstanding (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.5 |  |  |  |  |  |  | $ 0.4296875 |  |
Preferred stock distributions |  |  |  |  |  | $ 3,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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