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Long-Term Debt and Short-Term Borrowings - Schedule of Long-Term Debt (Parenthetical) (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 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 | 2.91% | 2.91%
5.00% Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate of long-term debt |  | 5.00%
5.00% Senior Notes [Member] | Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate of long-term debt | 5.00% | 5.00%
Redemption date | Mar. 31, 2018 | Mar. 31, 2018
4.875% Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate of long-term debt | 4.875% | 4.875%
4.875% Senior Notes [Member] | 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%
5.25% Senior Notes [Member] | 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

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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