Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Summary of Changes in Stockholders' Equity (Detail)

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Stockholders' Equity - Summary of Changes in Stockholders' Equity (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Senior Common Stock [Member]
Jun. 30, 2013
Preferred Stock [Member]
Dec. 31, 2012
Preferred Stock [Member]
Jun. 30, 2013
Common Stock [Member]
Jun. 30, 2013
Capital in Excess of Par Value [Member]
Jun. 30, 2013
Notes Receivable from Employees [Member]
Jun. 30, 2013
Distributions in Excess of Accumulated Earnings [Member]
Class of Stock [Line Items]                      
Beginning Balance     $ 122,365      $ 2 $ 2 $ 11 $ 215,470 $ (410) $ (92,708)
Issuance of senior common stock and common stock, net     54,087          3 54,084    
Repayment of principal on employee notes receivable     35              35  
Distributions declared to common, senior common and preferred stockholders     (10,988)                (10,988)
Net income 451 854 883 2,155              883
Ending Balance $ 166,382   $ 166,382      $ 2 $ 2 $ 14 $ 269,554 $ (375) $ (102,813)