Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Debt - Schedule of Debt (Parenthetical) (Detail)			12 Months Ended
Debt - Schedule of Debt (Parenthetical) (Detail)	Oct. 15, 2018	Aug. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Jun. 07, 2017
Term Loan Credit Agreement
Debt Instrument [Line Items]
Interest rate			7.51%
Maturity date			Jan. 15, 2024
11.25% Senior Notes Due February 1, 2019
Debt Instrument [Line Items]
Interest rate			11.25%
Maturity date			Feb. 01, 2019
Effective interest rate			13.25%	13.25%
7.625% Senior Notes Due June 15, 2020
Debt Instrument [Line Items]
Interest rate	7.625%		7.625%
Maturity date	Jun. 15, 2020		Jun. 15, 2020
7.875% Senior Notes Due March 15, 2021
Debt Instrument [Line Items]
Interest rate	7.875%		7.875%
Maturity date	Mar. 15, 2021		Mar. 15, 2021
8.875% Debentures Due April 15, 2021
Debt Instrument [Line Items]
Interest rate			8.875%
Maturity date			Apr. 15, 2021
7.00% Senior Notes Due February 15, 2022
Debt Instrument [Line Items]
Interest rate		7.00%	7.00%
Maturity date		Feb. 15, 2022	Feb. 15, 2022
6.50% Senior Notes Due November 15, 2023
Debt Instrument [Line Items]
Interest rate			6.50%
Maturity date			Nov. 15, 2023
6.00% Senior Notes Due April 1, 2024
Debt Instrument [Line Items]
Interest rate			6.00%		6.00%
Maturity date			Apr. 01, 2024
6.625% Debentures Due April 15, 2029
Debt Instrument [Line Items]
Interest rate			6.625%			6.625%
Maturity date			Apr. 15, 2029
8.820% Debentures Due April 15, 2031
Debt Instrument [Line Items]
Interest rate			8.82%
Maturity date			Apr. 15, 2031