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Share-Based Payments - Additional Information (Detail) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Sep. 23, 2009
LTIP [Member]
Dec. 31, 2013
LTIP [Member]
Restricted Stock and Restricted Stock Units [Member]
Dec. 31, 2012
LTIP [Member]
Restricted Stock and Restricted Stock Units [Member]
Dec. 31, 2011
LTIP [Member]
Restricted Stock and Restricted Stock Units [Member]
Dec. 31, 2013
LTIP [Member]
Restricted Stock [Member]
Dec. 31, 2012
LTIP [Member]
Restricted Stock [Member]
Dec. 31, 2011
LTIP [Member]
Restricted Stock [Member]
Dec. 31, 2013
LTIP [Member]
RSU Vesting [Member]
Dec. 31, 2012
LTIP [Member]
RSU Vesting [Member]
Dec. 31, 2011
LTIP [Member]
RSU Vesting [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 $ 3,488,000 $ 3,624,000 $ 1,788,000   $ 3,488,000 $ 3,624,000 $ 1,788,000            
Fair value of vested shares               293,000 717,000 663,000 2,854,000 1,916,000 792,000
Unrecognized stock-based compensation expense               562,000     2,351,000    
Common stock, shares delivered                     3,057 67,354  
Stock units vested                     5,000 112,084  
Reduction of capital increase related to equity incentive plan                     $ 31,000 $ 779,000