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Income Taxes (Textual) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Debt Instrument [Line Items]          
Increase (decrease) in valuation allowance       $ (18,300)  
State tax expense (benefit)     $ 174   $ 217
5% Convertible Senior Notes due 2021          
Debt Instrument [Line Items]          
Increase (decrease) in valuation allowance   $ (8,600)      
State tax expense (benefit) $ 1     $ (17)