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Debt - Additional Information (Detail) - Convertible Senior Notes		3 Months Ended
	Apr. 17, 2017 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Senior Notes Due 2017
Debt Instrument [Line Items]
Aggregate principal amount		$ 95,000,000		$ 95,000,000
Interest rate		6.25%
Convertible Senior Notes Due 2021
Debt Instrument [Line Items]
Aggregate principal amount		$ 213,500,000		$ 213,500,000
Interest rate		5.50%
Interest expense, debt		$ 4,700,000	$ 700,000
Contractual interest coupon		2,900,000	500,000
Amortization of debt discount		1,500,000	200,000
Amortization of debt issuance costs		$ 300,000	$ 0
Subsequent Event | Senior Secured Notes Due 2022
Debt Instrument [Line Items]
Aggregate principal amount	$ 440,000,000
Interest rate	10.75%
Redemption price, percent of principal amount of notes redeemed	100.00%
Percent of notes with option to redeem	35.00%
Redemption price, percentage of principal amount	110.75%
Redemption price if required collateral coverage ratio not met, percentage of principal amount	100.00%
Minimum collateral coverage ratio	1.50
Collateral coverage ratio, amount added to cash and cash equivalents	4.75
Collateral coverage ratio, multiplier for Average Grantor EBITDA for seven most recent fiscal quarters	4
Period to redeem notes without default if required collateral coverage ratio not met	90 days
Redemption price if company experiences change of control, percent of principal amount	101.00%
Subsequent Event | Senior Notes Due 2017
Debt Instrument [Line Items]
Interest rate	6.25%

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