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Contractual Coupon Interest Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Debt Instrument [Line Items]        
Contractual coupon interest expense $ 809 $ 1,266 $ 2,541 $ 3,797
Accretion of discount and fees on the liability component $ 746 $ 1,090 $ 2,288 $ 3,215