cm:Member: us-gaap:WithdrawalFromMultiemployerDefinedBenefitPlanMember
| Withdrawal from Multiemployer Defined Benefit Plan [Member] |
| us-gaap:WithdrawalFromMultiemployerDefinedBenefitPlanMember |
| Obligation(s) resulting from employer withdrawal from a multiemployer 1) pension plan under circumstances that would give rise to an obligation or (b) other postretirement benefit plan under circumstances that would give rise to an obligation or an increase in the contribution to the fund during the remainder of the contract period to make up a shortfall necessary to fund the vested and negotiated benefits. |
| cm:Member |
| [Member] (nonnum:domainItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:WithdrawalFromMultiemployerDefinedBenefitPlanMember |