Members' Equity Members' Equity - Noncontrolling Interest (Details) (MPM Enterprises, LLC [Member])	Sep. 30, 2013
MPM Enterprises, LLC [Member]
Noncontrolling Interest [Line Items]
Noncontrolling interest, ownership percentage	50.00%

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

No definition available.

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant