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Receivables, Net Accounts Receivable Policy (Policies)
9 Months Ended
Sep. 30, 2012
5. Receivables, Net [Abstract]  
Retention Receivable Policy [Policy Text Block]
Non-escrow retention receivables are amounts that the project owner has contractually withheld that will be paid upon owner acceptance of contract completion. We evaluate our non-escrow retention receivables for collectability using certain customer information that includes the following:

Federal - includes federal agencies such as the Bureau of Reclamation, the Army Corp of Engineers, and the Bureau of Indian Affairs. The obligations of these agencies are backed by the federal government. Consequently, there is minimal risk of not collecting the amounts we are entitled to receive.    
State - primarily state departments of transportation. The risk of not collecting on these accounts is small; however, we have experienced occasional delays in payment as states have struggled with budget issues.
Local - these customers include local agencies such as cities, counties and other local municipal agencies. The risk of not collecting on these accounts is small; however, we have experienced occasional delays in payment as some local agencies have struggled to deal with budget issues.       
Private - includes individuals, developers and corporations. The majority of our collection risk is associated with these customers. We perform ongoing credit evaluations of our customers and generally do not require collateral, although the law provides us certain remedies, including, but not limited to, the ability to file mechanics’ liens on real property improved for private customers in the event of non-payment by such customers.

Accounts Receivable Collection Policy [Policy Text Block]
We regularly review our accounts receivable, including past due amounts, to determine their probability of collection. If it is probable that an amount is uncollectible, it is charged to bad debt expense and a corresponding reserve is established in allowance for doubtful accounts. If it is deemed certain that an amount is uncollectible, the amount is written off. Based on contract terms, non-escrow retention receivables are typically due within 60 days of owner acceptance of contract completion. We consider retention amounts beyond 60 days of owner acceptance of contract completion to be past due.