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GMFS Transaction (Schedule of Consideration) (Details) (GMFS, LLC [Member], USD $)
0 Months Ended
Oct. 31, 2014
GMFS, LLC [Member]
 
Business Acquisition [Line Items]  
Cash paid to owners of GMFS $ 62,847,452us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= zfc_GmfsLlcMember
Contingent consideration 11,430,413us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= zfc_GmfsLlcMember
Total consideration $ 74,277,865us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= zfc_GmfsLlcMember