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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018 USD ($) Unit Segment | Dec. 31, 2017 USD ($) Unit Segment | Dec. 31, 2016 USD ($) Unit Segment
Summary Of Significant Accounting Policies [Line Items] |  |  |
Approximate available remaining lease period for fee owned properties | 20 years |  |
Impairment of goodwill | $ 0 | $ 0 | $ 0
Requirements to be classified as capital lease, minimum amount of present value of future minimum lease payments against estimated fair value, percentage | 90.00% |  |
Requirements to be classified as capital lease, minimum length of lease term against estimated useful life, percentage | 75.00% |  |
General liability claim per occurrence, cap | $ 250,000 | 250,000 | 100,000
Aggregate annual cap per policy year | 4,750,000 | 3,900,000 | 3,350,000
Pre-funding claims and covers claims annual cap | 5,000,000 | 5,000,000 |
Medical claim per occurrence, cap | 250,000 | 250,000 | $ 150,000
Insurance Reserves | $ 10,827,000 | $ 8,252,000 |
Minimum Percentage for Tax position measure as largest amount of benefit | 50.00% |  |
Reportable operating segments | Segment | 2 | 2 | 2
U.S. Operating Segment |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of reporting units | Segment | 20 |  |
Multiplication Value to Cash flows for the determination of fair value of Reporting units | Unit | 8 | 8 | 8
International Operating Segment |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of reporting units | Segment | 7 |  |
Trade Names |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Impairment of intangible assets | $ 0 | $ 0 | $ 0
Minimum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Equity method investment, ownership percentage | 20.00% |  |
Amortization period of deferred charges and other assets | 1 year |  |
Maximum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Equity method investment, ownership percentage | 50.00% |  |
Cost method investment, ownership Percentage | 20.00% |  |
Amortization period of deferred charges and other assets | 17 years |  |
Pre-funding claims and covers claims per occurrence |  | $ 250,000 |

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