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Summary of Long-Term Debt (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
4.75% Senior Secured Notes Redeemed in 2020 |  |
Debt Instrument [Line Items] |  |
Debt instruments, maturity date | 2020 |
Senior notes, interest rate | 4.75% |
Unamortized net premium |  | $ 2,490
Unamortized discount |  | $ 70
2.65% Senior Secured Notes due 2030 |  |
Debt Instrument [Line Items] |  |
Debt instruments, maturity date | 2030 |
Senior notes, interest rate | 2.65% |
Unamortized discount | $ 2,193 |
5.00% Senior Secured Notes due 2026 |  |
Debt Instrument [Line Items] |  |
Debt instruments, maturity date | 2026 | 2026
Senior notes, interest rate | 5.00% | 5.00%
Notes Payable And Mortgages Payable |  |
Debt Instrument [Line Items] |  |
Obligations under capitalized leases | $ 52,905 | $ 17,818
Weighted average interest | 6.80% | 8.00%
Term Loans With Varying Maturities |  |
Debt Instrument [Line Items] |  |
Debt instruments, maturity date | 2050 |

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -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 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121616839&loc=d3e45280-112737 + Details
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