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Long-term debt - Additional Information (Detail) - USD ($) |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 15, 2020 | Jun. 09, 2020 | Feb. 13, 2020 | Jun. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt refinancing charges |  |  |  |  | $ 884,000 | $ 0 |
Weighted average effective interest rate at quarter end |  |  |  | 3.65% | 3.65% |  |
Weighted average effective interest rate during quarter |  |  |  | 3.64% | 3.98% |  |
Percentage of debt instruments bearing fixed interest rate |  |  |  | 54.00% | 54.00% |  |
Letters of credit outstanding |  |  |  | $ 57,452,000 | $ 57,452,000 |  |
Senior Notes Four Point Six Two Five Percent Due Twenty Thirty |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  |  | Jun. 01, 2030 |  |
Senior Notes |  | $ 1,750,000,000 |  | 1,750,000,000 | $ 1,750,000,000 |  | $ 0
Debt Instrument, Date of First Required Payment |  | Dec. 01, 2020 |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  | 40.00% |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 104.625% |  |  |  |  |
Debt Instrument related fees, discounts, and other professional expenses |  | $ 20,293,000 |  |  |  |  |
Weighted average effective interest rate during quarter |  | 4.625% |  |  | 4.625% |  |
Senior Notes Five Point One Two Five Percent Due Twenty Twenty Four |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  |  | Jul. 15, 2024 |  |
Senior Notes |  |  |  |  |  |  | $ 1,750,000,000
Weighted average effective interest rate during quarter |  |  |  |  | 5.125% |  |
Revolving line of credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  |  | Aug. 12, 2024 |  |
Maximum borrowing capacity on the revolving credit facilities |  |  |  | 1,000,000,000 | $ 1,000,000,000 |  |
Letter of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | 0 | $ 0 |  |
Term Loan B-1 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument Agreement Date |  |  | Feb. 13, 2020 |  |  |  |
Debt Instrument, Maturity Date |  |  | Aug. 12, 2026 |  | Aug. 12, 2026 |  |
Additional Debt Principal Amount Due To New Agreement |  |  | $ 0 |  |  |  |
Debt refinancing charges |  |  |  |  | $ 2,948,000 |  |
Noncash Financing Outflows Related To Extinguishment Of Long Term Debt |  |  |  |  | 55,895,000 |  |
Debt Instrument, Periodic Payment, Principal |  |  |  |  | $ 13,716,000 |  |
Term Loan B-1 | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
LIBOR plus interest rate margin |  |  | 1.75% |  |  |  |
Term Loan B |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  |  | Aug. 12, 2026 |  |
Cash outflows from extinguishment of secured debt |  |  |  |  | $ 68,842,000 |  |
Cash inflows from reborrowing of secured debt |  |  |  |  | $ 68,842,000 |  |
Term Loan A |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  |  | Aug. 12, 2024 |  |
Debt Instrument, Periodic Payment, Principal |  |  |  |  | $ 21,875,000 |  |
Long-term Line of Credit |  |  |  | $ 946,597,000 | $ 946,597,000 |  |
Senior Secured Credit Facilities |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Weighted average effective interest rate at quarter end |  |  |  | 2.10% | 2.10% |  |
2015 Interest Rate Cap Agreements Effective June 29, 2018 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Derivative, Maturity Date |  |  |  |  | Jun. 30, 2020 |  |
Derivative, effective date |  |  |  |  | Jun. 29, 2018 |  |
2019 Interest Rate Cap Agreements Effective June 30, 2020 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Derivative, Maturity Date |  |  |  |  | Jun. 30, 2024 |  |
Derivative, effective date |  |  |  |  | Jun. 30, 2020 |  |
Subsequent Event | Senior Notes Five Point One Two Five Percent Due Twenty Twenty Four |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument Redeemed Outstanding Principal Amount | $ 1,750,000,000 |  |  |  |  |  |
Debt Refinancing Call Premium Redemption Charge Incurred Upon Redemption Of Senior Notes | 29,890,000 |  |  |  |  |  |
Write off of Deferred Debt Issuance Cost | $ 9,764,000 |  |  |  |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the 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)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 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=120398452&loc=d3e534808-122878 Reference 3: 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)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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