Debt - Additional Information (Detail) - USD ($)		3 Months Ended	12 Months Ended				43 Months Ended
	Aug. 06, 2019	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Aug. 05, 2019	Sep. 05, 2019	Aug. 07, 2019	Mar. 27, 2019
Debt Instrument [Line Items]
Cash paid in exchange for outstanding debt			$ 56,700,000	$ 0	$ 0
Aggregate principal amount of convertible debt outstanding			574,300,000
Proceeds from capped call transactions			7,200,000	0	0
Charge recognized as a result of exchange		$ 20,100,000
2021 Notes
Debt Instrument [Line Items]
Aggregate principal amount						$ 1,000
Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			145,000,000.0
Accordion feature increase limit			150,000,000.0
Borrowings outstanding			0
Availability under the facility, net of letters of credit issued			$ 139,100,000
Springing maturity, period prior to maturity date of convertible senior notes due 2021			91 days
Springing maturity, period prior to maturity date of secured notes due 2022			60 days
Credit Agreement | Letters of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 30,000,000.0
Letters of credit outstanding			5,900,000
Installment Payment Agreement
Debt Instrument [Line Items]
Aggregate principal amount										$ 27,700,000
Interest rate										7.00%
Amount Maturing March 30, 2022
Debt Instrument [Line Items]
Aggregate principal amount										$ 4,800,000
Amount Maturing December 30, 2023
Debt Instrument [Line Items]
Aggregate principal amount										$ 22,900,000
Software Licenses Financing Agreement
Debt Instrument [Line Items]
Aggregate principal amount								$ 19,300,000
Interest rate								5.47%
Senior Notes | 2022 Notes
Debt Instrument [Line Items]
Aggregate principal amount			$ 440,000,000.0	440,000,000.0	$ 440,000,000.0
Interest rate			10.75%		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%
Aggregate principal amount of convertible debt outstanding			$ 434,500,000	432,000,000.0
Senior Notes | 2021 Notes
Debt Instrument [Line Items]
Aggregate principal amount			$ 84,200,000.0	213,500,000.0		$ 213,500,000
Interest rate			5.50%			5.50%
Effective interest rate						9.50%
Conversion rate (in shares)						102.4249
Total amount of conversion (in shares)						21,867,716
Conversion price (in dollars per share)			$ 12.75			$ 9.76
Payments for capped call transactions						$ 27,300,000
Conversion premium			60.00%			22.50%
Aggregate shares of common stock issued pursuant to exchange agreements (in shares)	10,593,930
Cash paid in exchange for outstanding debt	$ 59,400,000
Accrued and unpaid interest							$ 3,100,000
Aggregate principal amount of outstanding convertible debt included in debt conversion	129,300,000
Aggregate principal amount of convertible debt outstanding	84,200,000		$ 80,000,000.0	$ 194,200,000
Proceeds from capped call transactions	$ 7,200,000
Number of shares of common stock covered by remaining capped call transactions (in shares)									8,600,000
Charge recognized as a result of exchange		$ 20,100,000
Line of Credit | Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Requirement to maintain fixed charge coverage ratio, availability threshold, percent of lender commitments under facility			10.00%
Requirement to maintain fixed charge coverage ratio, availability threshold			$ 15,000,000.0
Amount of aggregate default under other debt that would trigger event of default			$ 50,000,000.0