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

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- Definition Land Development Performance Obligations, Letters Of Credit And Performance Bonds + References No definition available. + Details
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Namespace Prefix: | ccs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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