Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Other Liabilities Disclosure [Abstract]
Payroll and related employee benefits	$ 53,802	$ 56,860
Accrued insurance	44,471	41,154
Performance guarantees (see Note 1)	83,110	65,514
Other	37,204	37,407
Total	$ 218,587	$ 200,935