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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 |

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