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Debt - Additional Information (Detail)		3 Months Ended	9 Months Ended
	Apr. 13, 2016 USD ($) shares $ / shares	Sep. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Mar. 15, 2016 USD ($)
Debt Instrument [Line Items]
Payment of capped call transactions	$ 27,300,000		$ 27,300,000	$ 0
Interest expense, debt		$ 4,600,000	$ 9,900,000
Convertible Senior Notes Due 2021 Issued March 2016 | Convertible Senior Notes
Debt Instrument [Line Items]
Convertible senior notes, principal amount					$ 190,000,000
Convertible Senior Notes Due 2021 Issued April 2016
Debt Instrument [Line Items]
Convertible senior notes, principal amount	23,500,000.0
Convertible Senior Notes Due 2021 | Convertible Senior Notes
Debt Instrument [Line Items]
Convertible senior notes, principal amount	$ 213,500,000
Convertible senior notes interest rate	5.50%
Effective interest rate	9.50%
Conversion rate for the notes	0.1024249
Convertible shares total (in shares) | shares	21,867,716
Initial conversion price (in dollars per share) | $ / shares	$ 9.76
Debt discount	$ 33,600,000
Payment of capped call transactions	$ 27,300,000

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The price per share of the conversion feature embedded in the debt instrument.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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The number of equity instruments that the holder of the debt instrument would receive if the debt was converted to equity.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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