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Stockholder Equity and Non-Controlling Interest - 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 |  | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended |  |  |  |  | 1 Months Ended | 3 Months Ended |
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May 07, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Feb. 28, 2013 Distributions declared for the months of January through March 2013 | Feb. 28, 2013 Distributions declared for the months of April through June 2013 | Feb. 28, 2013 Subsequent event Distributions declared for the months of January through March 2013 | Feb. 28, 2013 Subsequent event Distributions declared for the months of April through June 2013 | Feb. 28, 2013 Subsequent event Noncontrolling Interest Distributions declared for the months of January through March 2013 | Feb. 28, 2013 Subsequent event Noncontrolling Interest Distributions declared for the months of April through June 2013 | Dec. 31, 2012 Nonaffiliated Entity | Dec. 31, 2012 Affiliated Entity | Jan. 04, 2012 Series Cumulative Non-Voting Preferred Stock | Dec. 31, 2012 Series Cumulative Non-Voting Preferred Stock Person | 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 | Feb. 28, 2013 Series A Preferred Stock Dividend Declared | 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 | Feb. 28, 2013 Common Stock Dividend Declared Distributions declared for the months of January through March 2013 | Feb. 28, 2013 Common Stock Dividend Declared Distributions declared for the months of April through June 2013 | Oct. 31, 2012 Series B Preferred Units | Dec. 31, 2012 Series B Preferred Units | Oct. 11, 2012 Series B Preferred Units
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued |  | 125 |  |  |  | 0 |  | 125 | 0 |  |  |  |  |  |  |  |  |  | 125 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock par value per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.50% | 12.50% | 12.50% | 12.50% | 12.50% | 12.50% | 12.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of investors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 125 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000.00 | $ 1,000.00 | $ 1,000.00 | $ 1,000.00 |  |  |  |  |  |  |  |  |  |  | $ 10.00 | $ 10.00 |  |  |
Preferred stock rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.34722222 | $ 0.34722222 | $ 0.34722222 | $ 0.34153005 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, distribution payment date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 28, 2013 |  |  | Jun. 30, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | January through March 2013 | April through June 2013 |  |  |
Dividend rate of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.00163934 | $ 0.00163934 | $ 0.00163934 | $ 0.00163934 |  |  |  |  | $ 0.00163934 | $ 0.00171233 | $ 0.00163934 | $ 0.00171233 |  |  |
Dividend paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50 | $ 48 | $ 48 | $ 19 |  |  |  |  |  |  |  |  |  |  |
Common stock annualized distribution rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.00% | 6.25% |  |  |
Common stock, shares issued |  | 25,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,063 | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  | 3,000 |  |  | 3,000 | 31,461 | 3,015 | 3,193 | 0 | 0 |  |  |  |  |  |  | 225 | 3,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | April through June 2013 | January through March 2013 | April through June 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | October 11, 2012 through December 31, 2012 |
Non-controlling Interest per unit per day |  | $ 0.00163934 | $ 0.00163934 | $ 0.00163934 | $ 0.00163934 |  |  |  |  |  | $ 0.00163934 | $ 0.00171233 | $ 0.00163934 | $ 0.00171233 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling Interest total |  | 796 | 796 | 787 | 789 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 79 |
Series B Preferred Units, limited partnership units established |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400
Series B Preferred Units, preferential cash distributions percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |
Series B Preferred Units, purchase price per unit base for preferential cash distributions percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000 |  |
Series B Preferred Units, limited partnership units issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 350
Series B Preferred Units, proceeds from issuance of limited partnership units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,500 |  |
Non-controlling Interest distribution rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.78 |
Non-controlling Interest, percentage of annualized distribution rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.00% | 6.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Operating Partnership Unit Price |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00 | 10.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling Interest distribution rate | $ 2.78 |  |  |  |  | $ 2.78 |  | $ 2.78 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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