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Debt - Schedule of Debt Obligations (Parenthetical) (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2016	Nov. 14, 2014	Aug. 06, 2014
Term Debt [Member]
Debt Instrument [Line Items]
Interest rate on debt	5.50%	5.10%	4.50%
Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate on debt	11.00%	11.00%	11.00%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Available capacity	$ 300.0	$ 130.0	$ 130.0	$ 130.0	$ 130.0
Revolving Credit Facility [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Available capacity	$ 2.7	2.9	$ 7.7
Revolving Credit Facility [Member] | Previously Reported [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Available capacity		$ 8.4

X

- 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
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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X

- 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.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ 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
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Details

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- Details

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- Details

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- Details

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