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Related Party Transactions and Arrangements (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Related Party Transaction [Line Items]      
Common stock, shares outstanding (in shares) 162,463,456us-gaap_CommonStockSharesOutstanding   162,181,939us-gaap_CommonStockSharesOutstanding
Special Limited Partner      
Related Party Transaction [Line Items]      
Common stock, shares outstanding (in shares) 20,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arct_SpecialLimitedPartnerMember
  20,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arct_SpecialLimitedPartnerMember
Sponsor | Real Estate Investment Fund      
Related Party Transaction [Line Items]      
Related party transaction, amount $ 3,500,000us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_RelatedPartyTransactionAxis
= arct_RealEstateInvestmentFundMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arct_SponsorMember
   
Viceroy Hotel | Affiliated Entity      
Related Party Transaction [Line Items]      
Due from affiliates 17,000us-gaap_DueFromAffiliates
/ dei_LegalEntityAxis
= arct_ViceroyHotelMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
  23,000us-gaap_DueFromAffiliates
/ dei_LegalEntityAxis
= arct_ViceroyHotelMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
Revenue from Related Parties $ 15,000us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= arct_ViceroyHotelMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
$ 100,000us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= arct_ViceroyHotelMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember