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Condensed consolidating guarantor financial information - Additional Information (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Ownership percentage |  | 100.00%
Senior Notes | 5.25% Senior Notes due 2024 |  |
Debt Instrument [Line Items] |  |
Senior Notes | $ 250,000 | $ 250,000
Debt instrument, stated interest rate | 5.25% |
Senior Notes | 4.875% Senior Notes due 2026 |  |
Debt Instrument [Line Items] |  |
Senior Notes | $ 400,000 | 400,000
Debt instrument, stated interest rate | 4.875% |
Senior Notes | 4.625% Senior Notes due 2027 |  |
Debt Instrument [Line Items] |  |
Senior Notes | $ 500,000 | $ 500,000
Debt instrument, stated interest rate | 4.625% |

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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