Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Commitments and Contingencies [Abstract]
Outstanding letters of credit and performance bonds	$ 296.9	$ 158.6

Land Development Performance Obligations, Letters Of Credit And Performance Bonds

No definition available.

Name:	ccs_LandDevelopmentPerformanceObligationsLettersOfCreditAndPerformanceBonds
Namespace Prefix:	ccs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant