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Fair Value of Financial Instruments - Summary of Level 3 Inputs to Monte Carlo (Detail) (USD $)
12 Months Ended 0 Months Ended 1 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 9 Months Ended
Apr. 02, 2014
Dec. 31, 2013
Level 3
2018 Notes
Apr. 01, 2014
Level 3
2019 Notes
Apr. 01, 2014
Level 3
2019 Notes
Jan. 24, 2013
Senior Subordinated Notes
2018 Notes
Sep. 30, 2014
Senior Subordinated Notes
2018 Notes
Apr. 02, 2014
Senior Subordinated Notes
2019 Notes
Sep. 30, 2014
Senior Subordinated Notes
2019 Notes
Apr. 01, 2014
Senior Subordinated Notes
2019 Notes
Sep. 30, 2014
Senior Subordinated Notes
Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                    
Conversion rate         121.1240 121.1240 75.7576 75.7576    
Conversion price (in dollars per share)         $ 8.26       $ 13.20  
Maturity date         Feb. 01, 2018   Oct. 01, 2019      
Maturity of date of early payment feature           Nov. 01, 2016   Jan. 01, 2018    
Stock price (in dollars per share) $ 11.00 $ 10.89   $ 11.79           $ 7.46
Risk-free interest rate   1.31%                
Estimated credit spread     9.60%             8.90%
Estimated stock volatility   50.00% 53.00%             55.00%