Subscriptions, Distributions and Redemptions - Additional Information (Detail)	12 Months Ended
Dec. 31, 2018 USD ($)
Statement of Partners' Capital [Abstract]
Distributions made in general partner	$ 0
Fees charged to Limited Partners	$ 0

Distributions from earnings to the general partner of a partnership included in the consolidated financial statements.

No definition available.

Name:	us-gaap_GeneralPartnerDistributions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration