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Preferred Equity Investments - Additional Information (Details)	Sep. 30, 2018
Schedule Of Investments [Abstract]
Preferred equity ownership percentage	24.40%

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- Definition

Preferred equity ownership percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	pgre_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration