Related party transactions (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2012 URS [Member] Software, Services, License And Maintenance Services Agreement [Member]	Sep. 30, 2012 URS [Member] Software, Services, License And Maintenance Services Agreement [Member]	Sep. 30, 2013 Gores and Glendon [Member] Management Services [Member] Selling, General and Administrative Expenses [Member]	Sep. 30, 2012 Gores and Glendon [Member] Management Services [Member] Selling, General and Administrative Expenses [Member]	Sep. 30, 2013 Gores and Glendon [Member] Management Services [Member] Selling, General and Administrative Expenses [Member]	Sep. 30, 2012 Gores and Glendon [Member] Management Services [Member] Selling, General and Administrative Expenses [Member]	Sep. 30, 2013 Gores Group LLC [Member]	Sep. 30, 2013 Gores Group LLC [Member] Restricted Assets [Member]	Dec. 31, 2012 Gores Group LLC [Member] Restricted Assets [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	$ 239	$ 330	$ 1,205	$ 1,097	$ 194	$ 578	$ 239	$ 330	$ 1,205	$ 1,097
Management services agreement termination fee paid to Gores	9,000		9,000								9,000
Group health care plan deposits												$ 83	$ 750