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Fair Value Measurements - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Assets measured at fair value $ 0 $ 0 $ 0
Transfers between Levels $ 0 $ 0 $ 0
Significant Unobservable Inputs (Level 3) [Member]      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Discount rate of Senior Notes     11.37%
Senior Notes, redemption date   Apr. 07, 2015