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