Debt - Additional Information (Detail) - USD ($)			3 Months Ended	6 Months Ended		12 Months Ended	43 Months Ended
	Apr. 15, 2020	Aug. 06, 2019	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2016	Aug. 05, 2019	Dec. 31, 2019	Sep. 05, 2019	Aug. 07, 2019	Mar. 27, 2019
Debt Instrument [Line Items]
Loss on debt extinguishment				$ 28,500,000	$ 0
The Notes | Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount redeemed in full redemption	$ 440,000,000.0
Interest rate	10.75%							10.75%
Redemption price, percent of principal amount of notes redeemed	105.375%
Redemption price paid	$ 487,300,000
Call premium	23,650,000
Accrued interest	$ 23,650,000
Loss on debt extinguishment			$ 28,500,000
Premium			23,650,000
Write off of unamortized discount and fees related to issuance of the Notes			4,800,000
Aggregate principal amount								$ 440,000,000
Aggregate principal amount of convertible debt outstanding			$ 0	$ 0				434,500,000
2021 Notes
Debt Instrument [Line Items]
Aggregate principal amount						$ 1,000
2021 Notes | Senior Notes
Debt Instrument [Line Items]
Interest rate			5.50%	5.50%		5.50%
Aggregate principal amount			$ 84,200,000	$ 84,200,000		$ 213,500,000		84,200,000
Effective interest rate						9.50%
Debt conversion rate (in shares)						102.4249
Total number of convertible shares (in shares)						21,867,716
Conversion price (in dollars per share)			$ 12.75	$ 12.75		$ 9.76
Payments for capped call transactions						$ 27,300,000
Conversion premium percentage			60.00%	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 convertible 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	$ 81,800,000	$ 81,800,000				$ 80,000,000.0
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
Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			145,000,000.0	145,000,000.0
Accordion feature increase limit			150,000,000.0	150,000,000.0
Borrowings outstanding			59,000,000.0	59,000,000.0
Available borrowings			40,600,000	$ 40,600,000
Springing maturity date, period prior to maturity date of convertible debt				91 days
Credit Agreement | Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity			30,000,000.0	$ 30,000,000.0
Letters of credit outstanding			$ 5,700,000	$ 5,700,000
Credit Agreement | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Requirement to maintain minimum fixed charge coverage ratio, availability threshold, percent of lenders' commitments under facility			10.00%	10.00%
Requirement to maintain minimum fixed charge coverage ratio, availability threshold			$ 15,000,000.0	$ 15,000,000.0
Amount of aggregate default under other debt that would trigger event of default			50,000,000.0	50,000,000.0
Installment Payment Agreement
Debt Instrument [Line Items]
Interest rate											7.00%
Aggregate principal amount											$ 27,700,000
Amount reported in current maturities of long-term debt			6,200,000	6,200,000
Software Licenses Financing Agreement
Debt Instrument [Line Items]
Interest rate									5.47%
Aggregate principal amount									$ 19,300,000
Amount reported in current maturities of long-term debt			$ 3,600,000	$ 3,600,000