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Share-Based Payments - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 23, 2009
LTIP [Member]
Sep. 30, 2014
LTIP [Member]
Restricted Stock and Restricted Stock Units [Member]
Sep. 30, 2013
LTIP [Member]
Restricted Stock and Restricted Stock Units [Member]
Sep. 30, 2014
LTIP [Member]
Restricted Stock and Restricted Stock Units [Member]
Sep. 30, 2013
LTIP [Member]
Restricted Stock and Restricted Stock Units [Member]
Sep. 30, 2014
LTIP [Member]
Restricted Stock [Member]
Sep. 30, 2014
LTIP [Member]
RSUs [Member]
Sep. 30, 2014
LTIP [Member]
RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Percentage of issued and outstanding shares of common stock provides for grants of restricted common stock, restricted stock units and other equity-based awards         7.50%              
Recognized stock-based compensation expense $ 308 $ 784 $ 1,096 $ 2,095   $ 308 $ 784 $ 1,096 $ 2,095      
Unrecognized compensation expense                   540 1,611 1,611
Common stock, shares delivered                     240,277  
Stock units vested                     283,750  
Adjustment to additional paid in capital, tax liability                       $ 876