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GMFS Transaction (Narrative) (Details) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Oct. 31, 2014
Business Acquisition [Line Items]    
Amortization expense related to intangible assets $ 131,389us-gaap_AmortizationOfIntangibleAssets  
Goodwill, Tax Deductible Period 15 years  
GMFS, LLC [Member]    
Business Acquisition [Line Items]    
Cash payments to acquire entity   62,847,452us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= zfc_GmfsLlcMember
Percentage of price which may be paid in stock   50.00%zfc_BusinessCombinationContingentConsiderationArrangementsPercentageWhichMayBePaidInStock
/ us-gaap_BusinessAcquisitionAxis
= zfc_GmfsLlcMember
Contingent consideration   11,430,413us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= zfc_GmfsLlcMember
Maximum contingent consideration   20,000,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= zfc_GmfsLlcMember
GMFS, LLC [Member] | Each Discrete Payment [Member]    
Business Acquisition [Line Items]    
Contingent consideration   1,000,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= zfc_GmfsLlcMember
/ us-gaap_ContingentConsiderationByTypeAxis
= zfc_EachDiscretePaymentMember
GMFS, LLC [Member] | Deferred Premium Payments [Member]    
Business Acquisition [Line Items]    
Contingent consideration   $ 2,000,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= zfc_GmfsLlcMember
/ us-gaap_ContingentConsiderationByTypeAxis
= zfc_DeferredPremiumPaymentsMember