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Debt - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended 43 Months Ended
Apr. 15, 2020
Aug. 06, 2019
Jun. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 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 $ 20,200,000            
Proceeds from capped call transactions         0 $ 7,200,000            
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                 $ 440,000,000.0      
Aggregate principal amount of convertible debt outstanding         $ 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%          
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          
Conversion price (in dollars per share)         $ 12.75   $ 9.76          
Payments for capped call transactions             $ 27,300,000          
Conversion premium percentage         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     $ 82,700,000       $ 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                
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              
Available borrowings         $ 71,200,000              
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         $ 5,800,000              
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         6,300,000              
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