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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) Segment | Dec. 31, 2019 USD ($) Segment | Dec. 31, 2018 USD ($) Segment
Summary Of Significant Accounting Policies [Line Items] |  |  |
Restricted Cash | $ 13,847 |  |
General liability claim per occurrence, cap | 500 | $ 500 | $ 250
Aggregate annual cap per policy year | 0 | 0 | 4,750
Pre-funding claims and covers claims annual cap | 5,000 | 5,000 | 5,000
Medical claim per occurrence, cap | 250 | 250 | $ 250
Insurance Reserves | $ 9,034 | $ 11,577 |
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 |  |
International Operating Segment |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of reporting units | Segment | 7 |  |
Minimum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Equity method investment, ownership percentage | 20.00% |  |
Maximum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Equity method investment, ownership percentage | 50.00% |  |
Cost method investment, ownership Percentage | 20.00% |  |
Pre-funding claims and covers claims per occurrence |  |  | $ 250

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