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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Jun. 01, 2014
Summary Of Significant Accounting Policies [Line Items]      
Additional amounts to be paid in cash or common stock based on achievement of performance measures within period, maximum years 5 years    
Money market funds carrying amount $ 13.9 $ 5.1  
Carrying amount of cash surrender value of life insurance 14.5 16.0  
Contingent consideration liabilities related to acquisitions, fair value $ 24.9 $ 35.3  
Variable Interest Entity, Primary Beneficiary [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Consolidation method ownership percentage in joint venture 75.00%   75.00%
Unnamed Corporate Joint Venture [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Equity method ownership percentage in joint venture 37.50%   37.50%
Government Contracts Concentration Risk [Member] | Accounts Receivable [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Percentage of net accounts receivable 19.00% 19.00%  
Buildings [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment estimated useful lives, years 20 years    
Maximum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Long-term investments maturity period, in years 6 years    
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 10 years    
Maximum [Member] | Computer Equipment [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment estimated useful lives, years 10 years    
Maximum [Member] | Software and Software Development Costs [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment estimated useful lives, years 10 years    
Maximum [Member] | Furniture [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment estimated useful lives, years 10 years    
Minimum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Long-term investments maturity period, in years 1 year    
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