Long-Term Debt - Summary of Debt (Detail) - USD ($)	Jun. 30, 2019	May 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Outstanding Principal, noncurrent debt	$ 3,179,124,000		$ 3,049,174,000
Outstanding Principal, total debt	3,187,224,000		3,057,274,000
Unamortized Premium (Discount)	17,101,000		20,286,000
Unamortized Deferred Financing Costs	(31,476,000)		(32,365,000)
Net Carrying Amount, noncurrent	3,164,749,000		3,037,095,000
Net Carrying Amount	3,172,849,000		3,045,195,000
Senior Notes \| Senior Secured Revolving Credit Facilities
Debt Instrument [Line Items]
Outstanding Principal, noncurrent debt	134,000,000
Unamortized Premium (Discount)	0
Unamortized Deferred Financing Costs	0
Net Carrying Amount, noncurrent	$ 134,000,000
Senior Notes \| 8.750% Senior Notes due 2020
Debt Instrument [Line Items]
Debt instrument interest rate, percentage	8.75%
Outstanding Principal, noncurrent debt	$ 454,299,000		679,299,000
Unamortized Premium (Discount)	1,125,000		2,230,000
Unamortized Deferred Financing Costs	(2,659,000)		(5,380,000)
Net Carrying Amount, noncurrent	$ 452,765,000		676,149,000
Senior Notes \| 8.875% Senior Secured Notes Due 2022
Debt Instrument [Line Items]
Debt instrument interest rate, percentage	8.875%
Outstanding Principal, noncurrent debt	$ 270,000,000		270,000,000
Unamortized Premium (Discount)	(1,889,000)		(2,122,000)
Unamortized Deferred Financing Costs	(527,000)		(602,000)
Net Carrying Amount, noncurrent	$ 267,584,000		267,276,000
Senior Notes \| 7.875% Senior Secured Notes Due 2022
Debt Instrument [Line Items]
Debt instrument interest rate, percentage	7.875%
Outstanding Principal, noncurrent debt	$ 900,000,000		900,000,000
Unamortized Premium (Discount)	17,865,000		20,178,000
Unamortized Deferred Financing Costs	(11,165,000)		(12,799,000)
Net Carrying Amount, noncurrent	$ 906,700,000		907,379,000
Senior Notes \| 7.625% Senior Notes Due 2023
Debt Instrument [Line Items]
Debt instrument interest rate, percentage	7.625%
Outstanding Principal, noncurrent debt	$ 400,000,000		400,000,000
Unamortized Premium (Discount)	0		0
Unamortized Deferred Financing Costs	(3,502,000)		(3,922,000)
Net Carrying Amount, noncurrent	$ 396,498,000		396,078,000
Senior Notes \| 8.500% Senior Secured Notes Due 2024
Debt Instrument [Line Items]
Debt instrument interest rate, percentage	8.50%	8.50%
Outstanding Principal, noncurrent debt	$ 225,000,000
Unamortized Premium (Discount)	0
Unamortized Deferred Financing Costs	(4,881,000)
Net Carrying Amount, noncurrent	220,119,000
Term Loan \| Term Loan
Debt Instrument [Line Items]
Outstanding Principal, noncurrent debt	795,825,000		799,875,000
Outstanding Principal, current maturities	8,100,000		8,100,000
Unamortized Premium (Discount)	0		0
Unamortized Deferred Financing Costs	(8,742,000)		(9,662,000)
Net Carrying Amount, noncurrent	787,083,000		790,213,000
Revolving Credit Facility
Debt Instrument [Line Items]
Net Carrying Amount	134,000,000		0
Deferred financing costs, net	$ 1,600,000		$ 2,100,000

Long-term Debt, Gross, Excluding Current Maturities

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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