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Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price, 2014 (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price, 2014 [Line Items]    
Goodwill $ 490,007,000us-gaap_Goodwill [1] $ 495,679,000us-gaap_Goodwill [1]
Scenario, Previously Reported [Member] | 2014 Acquisitions [Member] | Customer Relationships [Member]    
Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price, 2014 [Line Items]    
Intangible assets   50,216,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= exam_TheAcquisitions2014Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Scenario, Previously Reported [Member] | 2014 Acquisitions [Member] | Trade Names [Member]    
Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price, 2014 [Line Items]    
Intangible assets   10,342,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= exam_TheAcquisitions2014Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Scenario, Previously Reported [Member] | 2014 Acquisitions [Member] | Noncompete Agreements [Member]    
Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price, 2014 [Line Items]    
Intangible assets   590,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= exam_TheAcquisitions2014Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Scenario, Previously Reported [Member] | 2014 Acquisitions [Member] | Technology-Based Intangible Assets [Member]    
Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price, 2014 [Line Items]    
Intangible assets   1,870,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= exam_TheAcquisitions2014Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Scenario, Previously Reported [Member] | 2014 Acquisitions [Member]    
Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price, 2014 [Line Items]    
Equipment and leasehold improvements   886,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= exam_TheAcquisitions2014Member
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Goodwill   136,034,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= exam_TheAcquisitions2014Member
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Net deferred tax liability associated with step-up in book basis   (9,041,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= exam_TheAcquisitions2014Member
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Assets acquired and liabilities assumed, net   3,785,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= exam_TheAcquisitions2014Member
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Totals   194,682,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= exam_TheAcquisitions2014Member
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Scenario, Adjustment [Member] | 2014 Acquisitions [Member]    
Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price, 2014 [Line Items]    
Goodwill   468,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= exam_TheAcquisitions2014Member
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioAdjustmentMember
Assets acquired and liabilities assumed, net   (377,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= exam_TheAcquisitions2014Member
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioAdjustmentMember
Totals 91,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= exam_TheAcquisitions2014Member
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioAdjustmentMember		 91,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= exam_TheAcquisitions2014Member
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioAdjustmentMember
2014 Acquisitions [Member] | Customer Relationships [Member]    
Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price, 2014 [Line Items]    
Intangible assets 50,216,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= exam_TheAcquisitions2014Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		  
2014 Acquisitions [Member] | Trade Names [Member]    
Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price, 2014 [Line Items]    
Intangible assets 10,342,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= exam_TheAcquisitions2014Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember		  
2014 Acquisitions [Member] | Noncompete Agreements [Member]    
Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price, 2014 [Line Items]    
Intangible assets 590,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= exam_TheAcquisitions2014Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember		  
2014 Acquisitions [Member] | Technology-Based Intangible Assets [Member]    
Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price, 2014 [Line Items]    
Intangible assets 1,870,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= exam_TheAcquisitions2014Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember		  
2014 Acquisitions [Member]    
Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price, 2014 [Line Items]    
Equipment and leasehold improvements 886,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= exam_TheAcquisitions2014Member		  
Goodwill 136,502,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= exam_TheAcquisitions2014Member		  
Net deferred tax liability associated with step-up in book basis (9,041,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= exam_TheAcquisitions2014Member		  
Assets acquired and liabilities assumed, net 3,408,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= exam_TheAcquisitions2014Member		  
Totals $ 194,773,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= exam_TheAcquisitions2014Member		 $ 194,800,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= exam_TheAcquisitions2014Member
[1] Goodwill recorded in connection with certain tax benefits to be realized in the Company's U.S. income tax returns has been reflected in the United States segment.