cm:Concept: us-gaap:IncreaseDecreaseInEarnestMoneyDepositsOutstanding
| Increase (Decrease) in Earnest Money Deposits Outstanding |
| us-gaap:IncreaseDecreaseInEarnestMoneyDepositsOutstanding |
| The increase (decrease) during the reporting period in the amount of deposits given by the reporting entity to a seller which shows that the prospective buyer is serious about purchasing a property. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Credit |
| false |
| us-gaap:IncreaseDecreaseInEarnestMoneyDepositsOutstanding |