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Long-Term Debt - Summary of Long-Term Debt (Parenthetical) (Detail) - Jun. 30, 2015
Total
Senior Notes [Member]  
Debt Instrument [Line Items]  
Fixed annual rate of interest 8.00%
Debt instrument, maturity date Jan. 30, 2020
Convertible Senior Notes [Member]  
Debt Instrument [Line Items]  
Debt instrument stated interest rate 3.875%
Debt instrument, maturity date Mar. 15, 2019