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Subsequent Events - Additional Information (Detail) (USD $)
3 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Shares Vesting [Member]
Apr. 01, 2013
Subsequent Event [Member]
Apr. 01, 2013
Subsequent Event [Member]
Shares Vesting [Member]
Mar. 31, 2013
Dividend Declared [Member]
Subsequent Event [Line Items]            
Dividend declared per share of common stock $ 0.40 $ 0.40       $ 0.40
Declaration Date           May 01, 2013
Payment Date           Jul. 12, 2013
Record Date           Jun. 28, 2013
Granted, restricted shares of common stock     20,000   2,826  
Initial vesting date     Dec. 01, 2013 Jul. 01, 2013    
Final vesting date     Dec. 01, 2015 Apr. 01, 2016