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Long-Term Debt - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2013
Jun. 30, 2013
Jun. 30, 2013
Jan. 25, 2013
Jan. 17, 2013
Debt Instrument [Line Items]          
Aggregate principal amount       $ 5,250 $ 35,000
Underwriting and issuance costs 1,560   1,525    
Prospectus supplement date     Jan. 10, 2013    
Quarterly payments dates, one     January 30    
Quarterly payments dates, two     April 30    
Quarterly payments dates, three     July 30    
Quarterly payments dates, four     October 30    
Quarterly payment start date     Apr. 30, 2013    
Notes redemption date     Jan. 30, 2016    
Redemption price as percentage of principal amount redeemed     100.00%    
Interest expense with respect to the senior notes   846 1,532    
Amortization of debt issuance costs   41 74    
Maximum [Member]
          
Debt Instrument [Line Items]          
Notice period for redemption of Notes     60 days    
Minimum [Member]
          
Debt Instrument [Line Items]          
Notice period for redemption of Notes     30 days    
Unsecured Senior Note [Member]
          
Debt Instrument [Line Items]          
Net proceeds after underwriting and issuance costs 38,690        
Maturity date of notes     Jan. 30, 2020    
Fixed annual rate of interest         8.00%
Interest expense with respect to the senior notes   $ 846 $ 1,532    
Effective interest rate   8.70% 8.70%