Subscriptions, Distributions and Redemptions - Additional Information (Detail)	12 Months Ended
Dec. 31, 2017 USD ($)
Equity [Abstract]
Redemptions fee charged to limited partners	$ 0
Period of notice to redeem limited Partnership	3 days

Notice period required for redemption of limited partnership valued at net asset value.

No definition available.

Name:	ck0001353282_NoticePeriodRequiredForRedemptionOfLimitedPartnershipValuedAtNetAssetValue
Namespace Prefix:	ck0001353282_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration