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Stockholders' Equity - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended |  | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 Series K Cumulative Redeemable Preferred Stock [Member] | Sep. 30, 2013 Series J Cumulative Redeemable Preferred Stock [Member] | Sep. 30, 2013 ATM [Member] | Mar. 01, 2012 ATM [Member] | Sep. 30, 2013 Restricted Stock [Member] | Sep. 30, 2013 LTIP Unit Awards | Sep. 30, 2013 Series F Preferred Stock [Member] | Sep. 30, 2013 Noncontrolling Interest | Sep. 30, 2012 Noncontrolling Interest
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Depositary shares redeemed |  |  |  |  | 2,000,000 | 4,000,000 |  |  |  |  |  |  |
Payments for repurchase of redeemable preferred stock |  |  | $ 150,000 | $ 0 |  |  |  |  |  |  |  |  |
Portion of preferred stock |  |  |  |  | 0.0001 | 0.0001 |  |  |  |  |  |  |
Dividend rate per share |  |  |  |  | 7.25% | 7.25% |  |  |  |  |  |  |
Par value of each depositary share |  |  |  |  | $ 0.01 | $ 0.01 |  |  |  |  |  |  |
Redemption price per share |  |  |  |  | $ 25.00 | $ 25.00 |  |  |  |  |  |  |
Preferred dividend per depositary share |  |  |  |  | $ 0.090625 | $ 0.055382 |  |  |  |  |  |  |
Total preferred dividend, depositary shares |  |  |  |  | 181 | 221 |  |  |  |  |  |  |
Cost associated with share redemption | 2,121 | 0 | 5,667 | 0 | 2,121 | 3,546 |  |  |  |  |  |  |
Underwritten public offering shares |  |  | 8,400,000 |  |  |  |  |  |  |  |  |  |
Net proceeds from underwriting |  |  | 132,050 |  |  |  |  |  |  |  |  |  |
Shares of common stock issuable under at-the-market offering |  |  |  |  |  |  |  | 12,500,000 |  |  |  |  |
Common stock issued under at-the-market offering |  |  |  |  |  |  | 2,315,704 |  |  |  |  |  |
Aggregate gross sale proceeds |  |  |  |  |  |  |  | 125,000 |  |  |  |  |
Proceeds from the issuance of common stock |  |  | 174,081 | 134,905 |  |  | 41,735 |  |  |  |  |  |
Noncontrolling interest reclassified to equity |  |  | 0 | 0 |  |  |  |  |  |  |  | 943 | 2,710
Conversion of units to common stock |  |  | 99,508 |  |  |  |  |  |  |  |  |  |
Restricted stock/unit awards to employees |  |  |  |  |  |  |  |  | 284,461 | 718,960 |  |  |
Fair value of Long Term Incentive Program unit awards |  |  |  |  |  |  |  |  |  | 5,411 |  |  |
Minimum Percentage Of Shares Obtainable Under Long Term Incentive Program |  |  |  |  |  |  |  |  |  | 0.00% |  |  |
Maximum Percentage Of Shares Obtainable Under Long Term Incentive Program |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
Fair value of restricted stock/unit awards |  |  |  |  |  |  |  |  | 4,719 |  |  |  |
Vesting period of restricted stock/unit awards to employees |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Compensation expense related to restricted shares issued during the quarter |  |  | 1,008 |  |  |  |  |  |  |  |  |  |
Amortization related to restricted stock and unit awards | 1,769 | 1,309 | 4,436 | 3,707 |  |  |  |  |  |  |  |  |
Amount of share based compensation expense capitalized | 15 | 19 | 32 | 19 |  |  |  |  |  |  |  |  |
Unrecognized compensation expense related to restricted stock/unit awards | $ 9,094 |  | $ 9,094 |  |  |  |  |  |  |  |  |  |
Weighted average period during which unrecognized compensation expense is expected to be recognized |  |  | 0 years 10 months 26 days |  |  |  |  |  |  |  |  |  |
Minimum fixed coupon rate of preferred stock |  |  |  |  |  |  |  |  |  |  | 2.375% |  |
Number of years of U.S. treasury rate one |  |  |  |  |  |  |  |  |  |  | 30 years |  |
Number of years of U.S. treasury rate two |  |  |  |  |  |  |  |  |  |  | 10 years |  |
LIBOR rate |  |  |  |  |  |  |  |  |  |  | 3 month LIBOR |  |
New coupon rate of preferred stock |  |  |  |  |  |  |  |  |  |  | 5.935% |  |

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