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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
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