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Related Party - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Related Party Transaction [Line Items]    
Due to affiliates $ 27,299us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent $ 27,299us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent
Maturity Date 2017-10  
Note payable, fixed bearing interest rate 0.50%us-gaap_RelatedPartyTransactionRate  
CNBB-RDF Holdings, LP    
Related Party Transaction [Line Items]    
Due to affiliates 24,500us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= pgre_CNBBRDFHoldingsLPMember		  
CNBB-RDF Holdings Otto Family    
Related Party Transaction [Line Items]    
Due to affiliates $ 2,799us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= pgre_CNBBRDFHoldingsOttoFamilyMember