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Long-Term Debt and Short-Term Borrowings - Schedule of Long-Term Debt (Parenthetical) (Detail)	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Senior secured term loans [Member]
Debt Instrument [Line Items]
Maturity date of debt, end	Dec. 31, 2022	Dec. 31, 2022
Senior secured term loans [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate of long-term debt	2.51%	2.51%
Senior secured term loans [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate of long-term debt	3.15%	3.15%
4.875% Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate of long-term debt	4.875%	4.875%
Due date of long-term debt	2026	2026
5.25% Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate of long-term debt	5.25%	5.25%
Due date of long-term debt	2025	2025
5.00% Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate of long-term debt	5.00%	5.00%
Redemption date	Mar. 15, 2018	Mar. 15, 2018

X

- Definition

Debt Instrument Maturity Date Year

+ References

No definition available.

+ Details

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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

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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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X

- Definition

Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

+ 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)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

Date the debt instrument was repurchased, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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