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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Estimated Fair value of long term debt $ 133,000 $ 133,000 $ 123,000  
Carrying value of long term debt 134,575 134,575 $ 124,567  
Transfers in or out of Level 1, 2, or 3 $ 0 $ 0    
7.75% Convertible notes due 2018        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Debt instrument, interest rate percentage 7.75% 7.75% 7.75% 7.75%
Carrying value of long term debt $ 50,000 $ 50,000 $ 50,000