EMERGENCE FROM CHAPTER 11 (Details 2) (Disputed Claims Reserve, USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Disputed Claims Reserve
Summary of distributable claim reserves established under Chapter 11 Plan
Remaining undisbursed reserve amount	$ 0

Represents the distributable balance in the reserve.

No definition available.

Name:	chmt_BankruptcyClaimsDistributableBalanceAmount
Namespace Prefix:	chmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant