Revisions of Prior Period Financial Statements Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue earning equipment, net	$ 8,184,735	$ 7,201,886
Total assets	10,967,809	9,850,871	$ 9,168,340
Short-term debt and current portion of long-term debt	634,530	36,284
Accrued expenses and other current liabilities	543,352	513,679
Total current liabilities	1,680,255	1,110,815
Long-term debt	4,883,326	4,694,335
Other non-current liabilities	829,595	783,342
Deferred income taxes (1)	1,587,522	1,443,292
Total liabilities	8,980,698	8,031,784
Retained earnings	1,667,080	1,450,509
Total shareholders’ equity	1,987,111	1,819,087	$ 1,896,561	$ 1,467,255
Total liabilities and shareholders’ equity (1)	$ 10,967,809	9,850,871
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue earning equipment, net		6,994,400
Total assets		9,676,000
Short-term debt and current portion of long-term debt		12,200
Accrued expenses and other current liabilities		520,500
Total current liabilities		1,093,600
Long-term debt		4,500,300
Other non-current liabilities		786,700
Deferred income taxes (1)		1,476,000
Total liabilities		7,856,500
Retained earnings		1,450,900
Total shareholders’ equity		1,819,500
Total liabilities and shareholders’ equity (1)		9,676,000
Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue earning equipment, net		207,500
Total assets		174,900
Short-term debt and current portion of long-term debt		24,100
Accrued expenses and other current liabilities		(6,800)
Total current liabilities		17,200
Long-term debt		194,000
Other non-current liabilities		(3,400)
Deferred income taxes (1)		(32,700)
Total liabilities		175,300
Retained earnings		(400)
Total shareholders’ equity		(400)
Total liabilities and shareholders’ equity (1)		$ 174,900