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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, except Share data in Thousands, unless otherwise specified | 0 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 05, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 20, 2013
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Increase in number of authorized shares | 100,000 | 200,000 | 200,000 | 200,000
Stock split ratio | 2 |  |  |
Common stock remained |  | $ 0.01 | $ 0.01 |
Long-term investments maturity, minimum years |  | 1 year |  |
Long-term investments maturity, maximum years |  | 7 years |  |
Additional cash amounts to be paid based on achievement of performance measures within period, maximum years |  | 5 years |  |
Intangible assets finite lives |  | 1 year 7 months 6 days |  |
Money market funds carrying amount |  | $ 5.3 | $ 11.1 |
Cash surrender value, fair value |  | 17.1 | 13.8 |
Contingent consideration liabilities related to acquisitions |  | $ 43.0 | $ 37.7 |
Buildings [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property and equipment estimated useful lives, years |  | 20 years |  |
Government Contracts Concentration Risk [Member] | Accounts Receivable [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Percentage of net accounts receivable |  | 20.00% | 21.00% |
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 [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 |  |
Maximum [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
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 [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 |  |

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