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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 19, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Jun. 01, 2014
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Equity method ownership percentage in joint venture |  | 37.50%us-gaap_EquityMethodInvestmentOwnershipPercentage |  | 37.50%us-gaap_EquityMethodInvestmentOwnershipPercentage
Direct ownership percentage in joint venture |  |  |  | 75.00%us-gaap_MinorityInterestOwnershipPercentageByParent
Stock split ratio | 2 us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 |  |  |
Additional amounts to be paid in cash or common stock based on achievement of performance measures within period, maximum years |  | 5 years |  |
Intangible assets finite lives |  | 8 years 8 months 12 days |  |
Money market funds carrying amount |  | $ 5.1 us-gaap_MoneyMarketFundsAtCarryingValue | 5.3 us-gaap_MoneyMarketFundsAtCarryingValue |
Carrying amount of cash surrender value of life insurance |  | 16.0 us-gaap_CashSurrenderValueOfLifeInsurance | 17.1 us-gaap_CashSurrenderValueOfLifeInsurance |
Contingent consideration liabilities related to acquisitions |  | 35.3 us-gaap_BusinessCombinationLiabilitiesArisingFromContingenciesAmountRecognized | 43.0 us-gaap_BusinessCombinationLiabilitiesArisingFromContingenciesAmountRecognized |
Government Contracts Concentration Risk [Member] | Accounts Receivable [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Percentage of net accounts receivable |  | 20.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GovernmentContractsConcentrationRiskMember | 20.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GovernmentContractsConcentrationRiskMember |
Restatement Adjustment [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Deferred income taxes, reclassification adjustment from current to long-term |  | $ 40.7 us-gaap_PriorPeriodReclassificationAdjustment / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |
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 |  | 7 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 |  |

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- Definition The amount, measured at acquisition-date fair value, of all liabilities assumed that arise from contingencies and were recognized by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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