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Properties and Equipment - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2008 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Property, Plant and Equipment [Line Items] |  |  |  |
Net proceeds received from sale-leaseback transactions | $ 35.8 |  |  |
Deferred gain on sale-leaseback transactions | $ 29.0 | $ 8.7 | $ 10.6 |
Lease period for sale-leaseback transactions | 15 years |  |  |
Rental expense |  | 8.8 | 8.5 | $ 8.3
Minimum future rental commitments |  | 34.3 |  |
Minimum future rental commitments, year one |  | 8.9 |  |
Minimum future rental commitments, year two |  | 8.0 |  |
Minimum future rental commitments, year three |  | 6.9 |  |
Minimum future rental commitments, year four |  | 5.9 |  |
Minimum future rental commitments, year five |  | 3.4 |  |
Minimum future rental commitments, thereafter |  | 1.2 |  |
Other Current Liabilities |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Deferred gain on sale-leaseback transactions |  | $ 1.9 | $ 1.9 |

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