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Long-Term Debt - Redemption Price Percentage of Senior Secured Notes (Parenthetical) (Detail) - Senior Secured Notes [Member]	12 Months Ended
	Dec. 31, 2017
Currently [Member]
Debt Instrument [Line Items]
Redemption price	101.938%
2018 and Thereafter [Member]
Debt Instrument [Line Items]
Redemption price	100.00%

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

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