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Property and Equipment - Property and Equipment, Net (Detail) (USD $)
Mar. 31, 2015
Mar. 31, 2014
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 175,011,000us-gaap_PropertyPlantAndEquipmentGross $ 160,546,000us-gaap_PropertyPlantAndEquipmentGross
Less: accumulated depreciation and amortization (118,712,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (109,293,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 56,299,000us-gaap_PropertyPlantAndEquipmentNet 51,253,000us-gaap_PropertyPlantAndEquipmentNet
Software and Software Development Costs [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 101,955,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember		 90,887,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
Office Equipment And Computers [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 64,462,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= crvl_OfficeEquipmentAndComputersMember		 64,525,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= crvl_OfficeEquipmentAndComputersMember
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 8,594,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember		 $ 5,134,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember