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Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Oct. 03, 2012 Property | Dec. 31, 2012 SUMMIT HOTEL OP, LP | Dec. 31, 2011 SUMMIT HOTEL OP, LP | Feb. 13, 2011 IPO | Feb. 13, 2011 Private Placement | Feb. 13, 2011 Common Stock | Dec. 31, 2012 Common Stock | Oct. 03, 2012 Common Stock IPO | Feb. 13, 2011 Common Stock IPO | Feb. 13, 2011 Common Stock Private Placement | Dec. 31, 2012 Series A Cumulative Redeemable Preferred Stock | Dec. 31, 2011 Series A Cumulative Redeemable Preferred Stock | Oct. 28, 2011 Series A Cumulative Redeemable Preferred Stock IPO | Dec. 11, 2012 Series B Cumulative Convertible Redeemable Preferred Stock IPO | Dec. 31, 2012 9.25% Series A Preferred Stock | Dec. 31, 2012 7.875% Series B Preferred Stock
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New issued stock (in shares) |  |  |  |  | 26,000,000 | 1,274,000 |  |  | 13,800,000 | 26,000,000 | 1,274,000 |  |  | 2,000,000 | 3,000,000 |  |
Proceeds from equity offerings, net of offering costs |  |  |  |  |  |  | $ 240.8 |  | $ 106.4 |  |  |  |  | $ 47.9 | $ 72.5 |  |
Public offering underwriting discount |  |  |  |  |  |  | 17.7 |  |  |  |  |  |  |  |  |  |
Public offering related expense |  |  |  |  |  |  | $ 7.3 |  | $ 6.1 |  |  |  |  | $ 2.1 | $ 2.5 |  |
Number of hotels acquired |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock redemptions |  |  |  |  |  |  |  | 4,873,625 |  |  |  |  |  |  |  |  |
Stock awards, independent directors and executive officers |  |  |  |  |  |  |  | 208,027 |  |  |  |  |  |  |  |  |
Percentage of redeemable preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.25% | 7.875% |  |
Preferred stock, liquidation preference |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25 | $ 25
Preferred stock dividend, per share |  |  |  |  |  |  |  |  |  |  |  | $ 2.31 | $ 0.21 |  |  | $ 2.3125 | $ 1.96875
Number of common units of operating partnership owned by unaffiliated third parties |  |  | 5,226,375 | 10,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of limited partnership interest in operating partnership |  |  | 10.00% | 27.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Common units redeemed | 4,873,625 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued to redeem common units | 4,873,625 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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