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Long-term Debt (Detail Textual) - USD ($) |  | 6 Months Ended |
--- | --- | --- | ---
Jan. 17, 2019 | Dec. 31, 2018 | Jun. 30, 2018
Debt Instrument [Line Items] |  |  |
Outstanding amount under Credit Facility |  | $ 1,064,934,000 | $ 1,073,394,000
Interest Rate Swap | Cash Flow Hedging |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate notional amount |  | 700,000,000 |
Bank Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility maximum borrowing capacity |  | $ 2,038,400,000 |
Credit facility borrowing capacity, description |  | At any time and so long as no default has occurred, the Company has the right to increase the Revolving Facility or the Term Loan in an aggregate principal amount of up to the greater of $400.0 million or an amount subject to 2.75 times senior secured leverage, calculated assuming the Revolving Facility is fully drawn, with applicable lender approvals. |
Credit Facility optional increases to borrowing capacity |  | $ 400,000,000 |
Ratio that restricts optional increases to borrowing capacity |  | 275.00% |
Outstanding borrowings interest rate |  | 3.27% |
Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility maximum borrowing capacity |  | $ 1,100,000,000 |
Outstanding amount under Credit Facility |  | 150,000,000 | 135,000,000
Revolving Credit Facility | Subsequent Event |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility maximum borrowing capacity | $ 1,500,000,000 |  |
Credit facility, increase in borrowing capacity | $ 400,000,000 |  |
Term loans |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility maximum borrowing capacity |  | 938,400,000 |
Outstanding amount under Credit Facility |  | $ 914,934,000 | $ 938,394,000
Term loan period |  | 5 years |
Loan maturity date |  | Jun. 30, 2023 |
Term loan frequency of payment |  | quarterly |
Term loans | Principal Payment Through June 30, 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Term loan principal payment |  | $ 11,700,000 |
Term loans | Principal Payment Thereafter June 30, 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Term loan principal payment |  | 23,500,000 |
Same-Day Swing Line Loan Revolving Credit Subfacility |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility maximum borrowing capacity |  | 100,000,000 |
Outstanding amount under Credit Facility |  | 0 |
Stand-By Letters Of Credit Revolving Credit Subfacility |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility maximum borrowing capacity |  | $ 25,000,000 |

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- Definition The amount the company can request to increase the Credit Facility (assuming no default), subject to applicable lender approvals. + References No definition available. + Details
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- Definition Senior secured leverage ratio that restricts optional increases to borrowing capacity. + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: 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=6879938&loc=d3e572229-122910 Reference 3: 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=6877327&loc=d3e13212-122682 Reference 4: 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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