REVENUES (Details)	12 Months Ended
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Payment terms	30 days

Revenue, Performance Obligation, Payment Terms, Period

No definition available.

Name:	cmp_RevenuePerformanceObligationPaymentTermsPeriod
Namespace Prefix:	cmp_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration