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Debt - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended 43 Months Ended
Aug. 06, 2019
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Aug. 05, 2019
Sep. 05, 2019
Mar. 27, 2019
Dec. 31, 2018
Debt Instrument [Line Items]                    
Cash paid in exchange for outstanding convertible debt     $ 56,300,000 $ 0            
Proceeds from capped call transactions     7,200,000 0            
Charge recognized as a result of exchange     20,200,000 $ 0            
2022 Notes | Senior Notes                    
Debt Instrument [Line Items]                    
Aggregate principal amount         $ 440,000,000.0          
Interest rate         10.75%          
Redemption price, percent of principal amount of notes redeemed         100.00%          
Percent of notes with option to redeem (up to)         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%          
2021 Notes                    
Debt Instrument [Line Items]                    
Aggregate principal amount           $ 1,000        
2021 Notes | Senior Notes                    
Debt Instrument [Line Items]                    
Aggregate principal amount   $ 84,200,000 $ 84,200,000     $ 213,500,000       $ 213,500,000
Interest rate   5.50% 5.50%     5.50%        
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% 60.00%     22.50%        
Conversion price (in dollars per share)   $ 12.75 $ 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 $ 79,100,000 $ 79,100,000             $ 194,200,000
Proceeds from capped call transactions $ 7,200,000                  
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   $ 145,000,000.0 145,000,000.0              
Accordion feature increase limit   150,000,000.0 150,000,000.0              
Borrowings outstanding   0 0              
Available borrowings   139,300,000 $ 139,300,000              
Springing maturity date, period prior to maturity date of convertible debt     91 days              
Springing maturity date, period prior to maturity date of secured debt     60 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]                    
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%