Convertible Senior Notes - Carrying Value of Notes Excluding the Discounts and Commissions Payable to the Initial Purchasers and Third Party Offering Costs (Detail) - Convertible senior notes due 2019 - USD ($) $ in Thousands	Feb. 02, 2019	Jun. 30, 2014
Liability component
Principal	$ 350,000
Less: Debt discount	(5,854)	$ (4,400)
Net carrying amount	344,146
Equity component	$ 70,482