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Long-Term Debt and Other Liabilities - Additional Information (Detail)
$ / shares in Units, shares in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Sep. 25, 2017
USD ($)
Sep. 20, 2017
USD ($)
Jan. 03, 2017
USD ($)
Jun. 14, 2016
USD ($)
Mar. 03, 2015
USD ($)
$ / shares
shares
Mar. 31, 2018
USD ($)
Trading_day
shares
Mar. 31, 2017
USD ($)
shares
Dec. 31, 2017
USD ($)
Sep. 19, 2017
USD ($)
Debt Instrument [Line Items]                    
Proceeds from issuance of debt               $ 70,200,000    
Total debt $ 1,021,603,000           $ 1,021,603,000   $ 1,017,064,000  
Amortization of deferred financing costs             1,035,000 $ 896,000    
Additional paid-in-capital 903,045,000           $ 903,045,000   898,729,000  
Forward stock repurchase transactions amount           $ 140,000,000        
Forward stock repurchase transaction, shares | shares             7.2 7.2    
Letters of Credit [Member]                    
Debt Instrument [Line Items]                    
Restricted cash 7,400,000           $ 7,400,000   7,400,000  
Convertible Notes [Member]                    
Debt Instrument [Line Items]                    
Forward stock repurchase transaction, shares | shares           7.2        
Forward stock repurchase transaction, settlement date           Mar. 01, 2020        
12.500% Senior Secured Notes Due 2022 [Member]                    
Debt Instrument [Line Items]                    
Aggregate principal amount         $ 525,000,000          
Interest rate         12.50%          
Unamortized debt premium and consent fees 14,800,000           $ 14,800,000   15,500,000  
Interest rate payable term             Semi-annually      
Maturity date             Jul. 01, 2022      
Loan origination fees             $ 11,400,000      
Amortization of deferred financing costs             600,000   500,000  
Debt issuance costs 12,000,000           $ 12,000,000   12,600,000  
12.500% Senior Secured Notes Due 2022 [Member] | Condition One [Member]                    
Debt Instrument [Line Items]                    
Debt instrument redemption price percentage of principal amount redeemed             35.00%      
Debt instrument redemption price, percentage             112.50%      
Outstanding redemption percentage             65.00%      
12.500% Senior Secured Notes Due 2022 [Member] | Condition Two [Member]                    
Debt Instrument [Line Items]                    
Debt instrument redemption price, percentage         100.00%          
12.500% Senior Secured Notes Due 2022 [Member] | Condition Three [Member]                    
Debt Instrument [Line Items]                    
Debt instrument redemption price, percentage         101.00%          
12.500% Senior Secured Notes Due 2022 [Member] | Additional Notes [Member] | January Two Thousand And Seventeen Additional Notes [Member]                    
Debt Instrument [Line Items]                    
Aggregate principal amount       $ 65,000,000            
Interest rate       12.50%            
Issue price as percentage of face value       108.00%            
Proceeds from issuance of debt       $ 70,200,000            
Loan origination fees             $ 2,000,000      
12.500% Senior Secured Notes Due 2022 [Member] | Additional Notes [Member] | September Two Thousand And Seventeen Additional Notes [Member]                    
Debt Instrument [Line Items]                    
Aggregate principal amount   $ 100,000,000                
Interest rate   12.50%                
Issue price as percentage of face value   113.00%                
Proceeds from issuance of debt   $ 113,000,000                
Accrued interest received   $ 2,900,000                
Loan origination fees             2,500,000      
12.500% Senior Secured Notes Due 2022 [Member] | Supplemental Indenture [Member]                    
Debt Instrument [Line Items]                    
Aggregate principal amount     $ 175,000,000             $ 75,000,000
Increase in debt amount     100,000,000              
Additional secured indebtedness     50,000,000              
Additional dividends     15,000,000              
Consent fees paid     $ 1,400,000              
3.75% Convertible Senior Notes [Member]                    
Debt Instrument [Line Items]                    
Aggregate principal amount 361,900,000         $ 361,900,000 $ 361,900,000   361,900,000  
Interest rate           3.75%        
Interest rate payable term             Semi-annually      
Maturity date           Mar. 01, 2020        
Amortization of deferred financing costs 400,000               400,000  
Debt issuance costs 3,200,000           $ 3,200,000   3,600,000  
Debt instrument redemption price, percentage           100.00%        
Option granted to initial purchasers           $ 60,000,000        
Additional paid-in-capital           100,000,000        
Convertible Notes, carrying amount of liability component $ 316,768,000         261,900,000 $ 316,768,000   311,544,000  
Effective interest rate on convertible notes 11.50%           11.50%      
Proceeds received from the issuance of the convertible notes           $ 361,900,000        
Convertible Notes, unamortized discount $ 45,100,000           $ 45,100,000   50,400,000  
Conversion rate           41.9274        
Principal amount           $ 1,000        
Conversion price | $ / shares           $ 23.85        
Multiples of principal amount           $ 1,000        
3.75% Convertible Senior Notes [Member] | Minimum [Member]                    
Debt Instrument [Line Items]                    
Percentage of common share price over conversion price for conversion             130.00%      
Common stock price trading days | Trading_day             20      
Common stock price consecutive trading days | Trading_day             30      
3.75% Convertible Senior Notes [Member] | Maximum [Member]                    
Debt Instrument [Line Items]                    
Debt instrument redemption price, percentage             98.00%      
Common stock price trading days | Trading_day             5      
Common stock price consecutive trading days | Trading_day             5      
3.75% Convertible Senior Notes [Member] | Issuance Costs [Member]                    
Debt Instrument [Line Items]                    
Loan origination fees 10,400,000                  
Additional paid-in-capital 2,900,000           $ 2,900,000      
Issuance cost recorded to deferred financing costs 7,500,000           7,500,000      
3.75% Convertible Senior Notes [Member] | Institutional Buyers [Member]                    
Debt Instrument [Line Items]                    
Aggregate principal amount           340,000,000        
Principal amount of Convertible Notes, subsequently exercised           $ 21,900,000        
Senior Secured Notes [Member]                    
Debt Instrument [Line Items]                    
Aggregate principal amount 690,000,000           690,000,000   690,000,000  
Total debt $ 704,835,000           $ 704,835,000   $ 705,520,000