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Long-Term Debt - Long-Term Debt (Parenthetical) (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Mar. 10, 2017 | Dec. 31, 2016 | May 09, 2013 | Jul. 02, 2012
--- | --- | --- | --- | --- | ---
7.0% Senior Subordinated Notes due 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate on debt agreement | 7.00% |  | 7.00% |  | 7.00%
Discount associated with notes |  |  | $ 1.1 |  |
5.0% Senior Subordinated Notes due 2023 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate on debt agreement | 5.00% |  | 5.00% | 5.00% |
6.125% Senior Subordinated Notes due 2027 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate on debt agreement | 6.125% | 6.125% | 6.125% |  |
2016 Revolving Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate | 2.25% |  | 2.25% |  |
Mortgage Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Discount associated with notes |  |  | $ 0.2 |  |
Mortgage Notes [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgage notes to finance companies-fixed rate, percentage | 3.51% |  |  |  |
Mortgage notes to finance companies-variable rate, percentage | 1.50% |  |  |  |
Mortgage Notes [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgage notes to finance companies-fixed rate, percentage | 7.03% |  |  |  |
Mortgage notes to finance companies-variable rate, percentage | 2.90% |  |  |  |

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- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 + Details
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