Schedule III - Real Estate and Accumulated Depreciation (Parenthetical) (Details) $ in Billions	Dec. 31, 2017 USD ($)
Real Estate And Accumulated Depreciation Disclosure [Abstract]
Assets and liabilities for tax purposes	$ 1.6

This amount represents the difference between the tax basis and the GAAP basis in the net carrying value of real estate.

No definition available.

Name:	pgre_NetBasisDifferenceOfAssetsAndLiabilitiesBetweenTaxBasisAndGaapBasis
Namespace Prefix:	pgre_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant