The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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Period Type:	duration

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
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Indebtedness - Senior Notes - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2018	Dec. 31, 2017	Oct. 05, 2017
Senior Notes
Debt Instrument [Line Items]
Maximum redemption price of notes as percentage of principal amount		101.00%
5.875% Senior Notes Due 2022
Debt Instrument [Line Items]
Interest rate on notes		5.875%	5.875%	5.875%
5.875% Senior Notes Due 2022 \| Senior Notes Exchange Offer \| Unsecured Debt
Debt Instrument [Line Items]
Senior notes exchange amount	$ 329,200
Interest rate on notes	5.875%
5.00% Senior Notes Due 2023
Debt Instrument [Line Items]
Senior notes exchange amount	$ 741,531
Interest rate on notes	5.00%	5.00%	5.00%	5.00%
5.00% Senior Notes Due 2022
Debt Instrument [Line Items]
Senior notes exchange amount	$ 580,032
Interest rate on notes	5.00%	5.00%	5.00%	5.00%
5.75% Senior Notes Due 2021
Debt Instrument [Line Items]
Senior notes exchange amount	$ 475,952
Interest rate on notes	5.75%	5.75%	5.75%	5.75%