Debt - Additional Information (Detail) - USD ($)			3 Months Ended			12 Months Ended	43 Months Ended
	Apr. 15, 2020	Aug. 06, 2019	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Dec. 31, 2016	Aug. 05, 2019	Mar. 19, 2020	Dec. 31, 2019	Sep. 05, 2019	Aug. 07, 2019	Mar. 27, 2019
Debt Instrument [Line Items]
Amount deposited with trustee, sufficient to fully pay redemption price, reported in restricted cash in current assets on balance sheet				$ 487,300,000					$ 0
The Notes | Senior Notes
Debt Instrument [Line Items]
Interest rate				10.75%
Amount deposited with trustee, sufficient to fully pay redemption price, reported in restricted cash in current assets on balance sheet				$ 487,300,000				$ 487,300,000
Aggregate principal amount				440,000,000					440,000,000
Aggregate principal amount of convertible debt outstanding				435,100,000					434,500,000
The Notes | Senior Notes | Principal Amount Due
Debt Instrument [Line Items]
Amount deposited with trustee, sufficient to fully pay redemption price, reported in restricted cash in current assets on balance sheet				440,000,000.0
The Notes | Senior Notes | Call Premium
Debt Instrument [Line Items]
Amount deposited with trustee, sufficient to fully pay redemption price, reported in restricted cash in current assets on balance sheet				23,650,000
The Notes | Senior Notes | Accrued Interest
Debt Instrument [Line Items]
Amount deposited with trustee, sufficient to fully pay redemption price, reported in restricted cash in current assets on balance sheet				$ 23,650,000
The Notes | Senior Notes | Subsequent Event
Debt Instrument [Line Items]
Aggregate principal amount redeemed in full redemption	$ 440,000,000.0
Interest rate	10.75%
Redemption price, percent of principal amount of notes redeemed	105.375%
Loss on debt extinguishment	$ 28,500,000
The Notes | Senior Notes | Subsequent Event | Forecast
Debt Instrument [Line Items]
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
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%
Aggregate principal amount				$ 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
Payments for capped call transactions						$ 27,300,000
Conversion premium percentage				60.00%		22.50%
Conversion price (in dollars per share)				$ 12.75		$ 9.76
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		$ 80,900,000					$ 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
Charge recognized as a result of exchange					$ 20,200,000
Charge recognized as a result of exchange, per diluted share (in dollars per share)					$ 0.35
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				59,000,000.0
Available borrowings				$ 20,100,000
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
Letters of credit outstanding				$ 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%
Requirement to maintain minimum 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
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												$ 6,100,000
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										$ 3,500,000