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Shareholder Equity and Non Controlling Interests - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  | 1 Months Ended | 3 Months Ended |  |  |  |  | 1 Months Ended
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May 07, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Sep. 30, 2013 | Dec. 31, 2012 | Jul. 25, 2013 | Dec. 31, 2011 | May 07, 2013 Subsidiaries | Feb. 28, 2013 Distributions declared for the months of January through March 2013 | Feb. 28, 2013 Distributions declared for the months of January through March 2013 Subsequent event | Feb. 28, 2013 Distributions declared for the months of April through June 2013 | Feb. 28, 2013 Distributions declared for the months of April through June 2013 Subsequent event | Jul. 25, 2013 Distributions declared for the months of July through September 2013 | Oct. 10, 2013 Distributions declared for the months of July through September 2013 Subsequent event | Aug. 19, 2013 Series A Preferred Stock | Feb. 28, 2013 Series A Preferred Stock | Aug. 09, 2012 Series A Preferred Stock | May 10, 2012 Series A Preferred Stock | Dec. 31, 2012 Common Stock | Sep. 30, 2012 Common Stock | Jun. 30, 2012 Common Stock | Mar. 31, 2012 Common Stock | Nov. 05, 2012 Common Stock | Aug. 09, 2012 Common Stock | May 10, 2012 Common Stock | Feb. 15, 2012 Common Stock | Feb. 28, 2013 Common Stock Distributions declared for the months of January through March 2013 | Feb. 28, 2013 Common Stock Distributions declared for the months of April through June 2013 | Aug. 19, 2013 Series B Units
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.34722222 | $ 0.34722222 | $ 0.34722222 |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, percentage of annualized distribution rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.50% | 12.50% | 12.50% | 12.50% |  |  |  |  |  |  |  |  |  |  |
Share price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000.00 | $ 1,000.00 | $ 1,000.00 |  |  |  |  |  |  |  |  |  |  |
Preferred stock, distribution payment date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 28, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares redeemed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 125 |  |  |  |  |  |  |  |  |  |  |  |  |  | 350
Preferred Stock redemption price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 140 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,500
Preferred stock, shares outstanding |  | 125 |  |  |  | 0 | 125 |  | 0 |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Common stock for months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | October, November and December 2012 | July, August and September 2012 | April, May and June 2012 | January, February and March 2012 | January through June 2013 | April through June 2013 |
Dividend rate of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.00163934 | $ 0.00163934 | $ 0.00163934 | $ 0.00163934 |  |  |  |  | $ 0.00163934 | $ 0.00171233 |
Non-controlling Interest for months |  | October, November and December 2012 | July, August and September 2012 | April, May and June 2012 | January, February and March 2012 |  |  |  |  |  | January through June 2013 | January through March 2013 | April through June 2013 | April through June 2013 | July through September 2013 | July through September 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling Interest per unit per day |  | $ 0.00163934 | $ 0.00163934 | $ 0.00163934 | $ 0.00163934 |  |  |  |  |  | $ 0.00163934 | $ 0.00163934 | $ 0.00171233 | $ 0.00171233 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partnership interest received in exchange for issuance of common stock |  |  |  |  |  |  |  |  |  | 5,274,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling Interest distribution rate | $ 2.78 |  |  |  |  | $ 2.78 | $ 2.78 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock redemption price |  |  |  |  |  |  |  | $ 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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