Commitments and Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Rental expense	$ 239,200	$ 244,300	$ 240,900
Future Minimum Rental Payment under Operating Leases (Table Details) [Abstract]
2015	174,120
2016	139,674
2017	99,771
2018	63,583
2019	32,175
Thereafter	7,182
Operating lease payments, total	516,505
Guarantor Obligations [Line Items]
Maximum financing amount	47,000
Amount outstanding	9,300
Citibank [Member]
Guarantor Obligations [Line Items]
Maximum financing amount	27,000
Texas Capital Bank [Member]
Guarantor Obligations [Line Items]
Maximum financing amount	$ 20,000