CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2021	Feb. 24, 2020
Coram Material Corp.
Accounts payable	$ 0.6	$ 0.6

Business Combination, Consideration Transferred, Accounts Payable Settled

No definition available.

Name:	uscr_BusinessCombinationConsiderationTransferredAccountsPayableSettled
Namespace Prefix:	uscr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant