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Stockholders' Equity - Additional Information (Detail) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Class of Stock [Line Items] |  |
Underwritten public offering shares | 8,400,000 |
Net proceeds from underwriting | $ 132,050,000 |
Conversion of Units to Common Stock | 0 | 0
Compensation Expense Related to Restricted Shares Issued during the Quarter | 1,008 |
Restricted Stock [Member] |  |
Class of Stock [Line Items] |  |
Restricted stock/unit awards to employees | 284,461 |
Fair value of restricted stock/unit awards | 4,719,000 |
Vesting period of restricted stock/unit awards to employees | 3 years |
Amortization Related to Restricted Stock and Unit Awards | 1,826,000 | 1,099,000
Amount of Share Based Compensation Expense Capitalized | 11,000 | 0
Unrecognized compensation expense related to restricted stock/unit awards | $ 6,310,000 |
Weighted average period during which unrecognized compensation expense is expected to be recognized | 1 year 1 month 24 days |
Series F Preferred Stock [Member] |  |
Class of Stock [Line Items] |  |
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 | 5.325% |

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