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

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Financial Instruments - Debt Fair Value and Carrying Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	May 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Face Value	$ 3,172,849		$ 3,045,195
Level 2
Debt Instrument [Line Items]
Face Value	3,053,224		3,057,274
Estimated Fair Value	$ 2,900,774		2,889,616
Senior Notes \| 2020 Notes
Debt Instrument [Line Items]
Stated Interest Rate	8.75%
Senior Notes \| 2020 Notes \| Level 2
Debt Instrument [Line Items]
Face Value	$ 454,299		679,299
Estimated Fair Value	$ 431,675		643,568
Senior Notes \| 2022 Private Placement Notes
Debt Instrument [Line Items]
Stated Interest Rate	8.875%
Senior Notes \| 2022 Private Placement Notes \| Level 2
Debt Instrument [Line Items]
Face Value	$ 270,000		270,000
Estimated Fair Value	$ 258,876		257,073
Senior Notes \| 2022 Notes
Debt Instrument [Line Items]
Stated Interest Rate	7.875%
Senior Notes \| 2022 Notes \| Level 2
Debt Instrument [Line Items]
Face Value	$ 900,000		900,000
Estimated Fair Value	$ 862,920		855,000
Senior Notes \| 2023 Notes
Debt Instrument [Line Items]
Stated Interest Rate	7.625%
Senior Notes \| 2023 Notes \| Level 2
Debt Instrument [Line Items]
Face Value	$ 400,000		400,000
Estimated Fair Value	$ 326,320		326,000
Senior Notes \| 2024 Notes
Debt Instrument [Line Items]
Stated Interest Rate	8.50%	8.50%
Senior Notes \| 2024 Notes \| Level 2
Debt Instrument [Line Items]
Face Value	$ 225,000		0
Estimated Fair Value	215,033		0
Term Loan \| Level 2
Debt Instrument [Line Items]
Face Value	803,925		807,975
Estimated Fair Value	$ 805,950		$ 807,975