Accrued Expenses and Other Current Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Other Liabilities Disclosure [Abstract]
Payroll and related employee benefits	$ 42,364	$ 36,447
Accrued insurance	39,868	43,014
Performance guarantees	30,727	37,255
Loss job reserves	11,605	12,429
Other	45,415	37,645
Total	$ 169,979	$ 166,790