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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |
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Dec. 31, 2020 | Dec. 31, 2019 | Aug. 31, 2020
Summary Of Significant Accounting Policies [Line Items] |  |  |
Cash and cash equivalents maturity description | 90 |  |
Additional amounts to be paid in cash or common stock based on achievement of performance measures within period, maximum years | 5 years |  |
Unnamed Corporate Joint Venture One [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Equity method ownership percentage in joint venture | 37.50% |  |
Unnamed Corporate Joint Venture Two [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Equity method ownership percentage in joint venture |  |  | 51.00%
Government Contracts Concentration Risk [Member] | Accounts Receivable [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Percentage of net accounts receivable | 22.00% | 21.00% |
Buildings [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated useful lives, years | 30 years |  |
Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Short-Term investments maturity period, in years | 1 year |  |
Intangible assets finite lives | 20 years |  |
Maximum [Member] | Medical Equipment [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated useful lives, years | 7 years |  |
Maximum [Member] | Computer Equipment [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated useful lives, years | 7 years |  |
Maximum [Member] | Software and Software Development Costs [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated useful lives, years | 7 years |  |
Maximum [Member] | Furniture [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated useful lives, years | 7 years |  |
Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Intangible assets finite lives | 1 year |  |
Minimum [Member] | Medical Equipment [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated useful lives, years | 3 years |  |
Minimum [Member] | Computer Equipment [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated useful lives, years | 3 years |  |
Minimum [Member] | Software and Software Development Costs [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated useful lives, years | 3 years |  |
Minimum [Member] | Furniture [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated useful lives, years | 3 years |  |

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