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The Company (Details 1)
Nov. 29, 2014
sqft
Area of Land 1,189,000us-gaap_AreaOfLand
West Palm Beach, FL [Member]  
Area of Land 112,000us-gaap_AreaOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= tphs_WestPalmBeachFlMember
Westbury, NY [Member]  
Area of Land 92,000us-gaap_AreaOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= tphs_WestburyNyMember
Paramus, NJ [Member]  
Area of Land 77,000us-gaap_AreaOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= tphs_ParamusNjMember
New York, NY Trinity Place Property [Member]  
Area of Land 57,000us-gaap_AreaOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= tphs_NewYorkNyTrinityPlacePropertyMember		 [1]
[1] The Trinity Place Property consists of a vacant 6-story commercial building of approximately 57,000 square feet, yielding approximately 174,000 square feet of zoning floor area as-of-right. The Company also has ownership of approximately 60,000 square feet of development rights from adjacent tax lots, one of which is owned in fee by the Company which is improved with a 4-story landmark building which cannot be demolished.