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Summary of Long-Term Debt (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |
Obligations under capitalized leases | $ 21,785 |
Term Loan A |  |
Debt Instrument [Line Items] |  |
Unamortized discount | $ 708 | $ 1,151
3.75% Senior Secured Notes due 2019 |  |
Debt Instrument [Line Items] |  |
Debt instruments, maturity date | 2019 |
Unamortized discount | $ 69 | 112
Senior notes, interest rate | 3.75% |
4.75% Senior Secured Notes due 2022 |  |
Debt Instrument [Line Items] |  |
Debt instruments, maturity date | 2022 |
Unamortized discount | $ 124 | 150
Senior notes, interest rate | 4.75% |
Unamortized net premium | $ 4,430 | 5,400
5.00% Senior Secured Notes due 2026 |  |
Debt Instrument [Line Items] |  |
Debt instruments, maturity date | 2026 |
Senior notes, interest rate | 5.00% |
Notes Payable And Mortgages Payable |  |
Debt Instrument [Line Items] |  |
Obligations under capitalized leases | $ 21,780 | $ 23,446
Weighted average interest | 9.10% | 8.90%
Term Loans With Varying Maturities |  |
Debt Instrument [Line Items] |  |
Debt instruments, maturity date | 2027 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 2: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=6879938&loc=d3e572229-122910 + Details
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