Acquisitions - Summary of Allocation of Purchase Price Between Assets Acquired and Liabilities Assumed (Parenthetical) (Details) $ in Thousands	Dec. 01, 2016 USD ($)
Business Combinations [Abstract]
Purchase price	$ 521,000
Assumed tenant improvement obligation	$ 3,471

Business combination recognized identifiable assets acquired, assumed tenant improvement obligation and liabilities assumed, net.

No definition available.

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