SIGNIFICANT ACCOUNTING POLICIES SIGNIFICANT ACCOUNTING POLICIES CASH, CASH EQUIVALENTS AND UNCASHED CHECKS (Details) (USD $)	Dec. 31, 2013
Accounting Policies [Abstract]
Bank Disbursement Account Balance	$ 0

Cash and Cash Equivalents, Bank Disbursement Account, Minimum Balance Allowed

No definition available.

Name:	clh_CashAndCashEquivalentsBankDisbursementAccountMinimumBalanceAllowed
Namespace Prefix:	clh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant