Organization - Additional Information (Detail)		6 Months Ended
	Aug. 03, 2006 USD ($) Trust shares	Jun. 30, 2015 Trust Basket shares	Dec. 31, 2014 shares
Organization [Line Items]
Number of series of trust | Trust		7
General Shares, shares issued		40	40
Number of shares in a basket		200,000
Fund offered common units to authorized participants in number of basket | Basket		1
PowerShares DB Base Metals Fund [Member]
Organization [Line Items]
Number of series of trust | Trust	7
Partners' capital contribution | $	$ 1,000
General Shares, shares issued	40