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RELATED PARTY TRANSACTIONS (Details) (Pinwrest [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Pinwrest [Member]
 
Related Party Transaction [Line Items]  
Loans Receivable with Fixed Rates of Interest $ 337us-gaap_LoansReceivableWithFixedRatesOfInterest1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiariesMember
Interest receivable on related party loan (in hundredths) 10.00%four_InterestReceivableOnRelatedPartyLoan
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiariesMember