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Long-Term Debt and Other Liabilities - Additional Information (Detail) $ / shares in Units, shares in Millions |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 25, 2017 USD ($) | Sep. 20, 2017 USD ($) | Jan. 03, 2017 USD ($) | Jun. 14, 2016 USD ($) | Mar. 03, 2015 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) Trading_day shares | Sep. 30, 2016 USD ($) shares | Sep. 19, 2017 USD ($) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  | $ 181,843,000 | $ 525,000,000 |  |
Total debt |  |  |  |  |  | $ 1,012,739,000 |  | 1,012,739,000 |  |  | $ 817,024,000
Amortization of deferred financing costs |  |  |  |  |  | 919,000 | $ 818,000 | 2,718,000 | $ 2,981,000 |  |
Additional paid-in-capital |  |  |  |  |  | 893,713,000 |  | $ 893,713,000 |  |  | 879,135,000
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 |  |  | 7,900,000
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 |  |  |  |  |  | 16,300,000 |  | $ 16,300,000 |  |  |
Interest rate payable term |  |  |  |  |  |  |  | Semi-annually |  |  |
Maturity date |  |  |  |  |  |  |  | Jul. 01, 2022 |  |  |
Loan origination fees |  |  |  |  |  |  |  | $ 11,400,000 |  |  |
Amortization of deferred financing costs |  |  |  |  |  | 500,000 | 400,000 | 1,600,000 | $ 500,000 |  |
Debt issuance costs |  |  |  |  |  | 13,200,000 |  | $ 13,200,000 |  |  | 11,200,000
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 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
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 | $ 1,100,000 | 1,000,000 |  |
Debt issuance costs |  |  |  |  |  | 4,000,000 |  | 4,000,000 |  |  | 5,100,000
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 |  |  |  |  | 261,900,000 | $ 306,462,000 |  | $ 306,462,000 |  |  | 292,024,000
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 |  |  |  |  |  | $ 55,400,000 |  | $ 55,400,000 |  |  | 69,900,000
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 |  |  |  |  |  |
Issuance cost recorded to deferred financing costs |  |  |  |  | 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 |  |  |  |  |  |
Amended and Restated Senior Term Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loan origination fees |  |  |  |  |  | 22,200,000 |  |  |  |  |
Amortization of deferred financing costs |  |  |  |  |  |  |  |  | $ 1,400,000 |  |
Outstanding principal balance paid |  |  |  | $ 287,700,000 |  |  |  |  |  |  |
Voluntary prepayment premium paid percentage |  |  |  | 3.00% |  |  |  |  |  |  |
Voluntary prepayment premium paid |  |  |  | $ 8,600,000 |  |  |  |  |  |  |
Write off of deferred financing costs |  |  |  | $ 6,800,000 |  |  |  |  |  |  |
Non lender fees |  |  |  |  |  | 4,100,000 |  |  |  |  |
Senior Secured Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | 690,000,000 |  | $ 690,000,000 |  |  | 525,000,000
Total debt |  |  |  |  |  | $ 706,277,000 |  | $ 706,277,000 |  |  | $ 525,000,000

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