Debt - Consolidated Secured Debt Ratios for the Senior Secured Notes due 2015 - (Details)	Sep. 30, 2013
Debt Instrument [Line Items]
Consolidated secured debt ratio	205.00%
April 1, 2013 — March 31, 2014
Debt Instrument [Line Items]
Secured Debt Ratio	7.00
April 1, 2014 — March 31, 2015
Debt Instrument [Line Items]
Secured Debt Ratio	6.75
April 1, 2015 — and thereafter
Debt Instrument [Line Items]
Secured Debt Ratio	6.50

The ratio applied to the debt for purposes of determining the ratio's for borrowing availability under the senior secured credit facility.

No definition available.

Name:	uscr_ConsolidatedSecuredDebtRatio
Namespace Prefix:	uscr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant