Related Party Transactions (Unaudited Financial Information from Significant Equity Investees) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Related Party Transactions [Abstract]
Revenues	$ 1,372,059	$ 1,010,639	$ 2,604,118	$ 2,357,338
Gross profit	45,915	33,054	90,336	62,810
Income (loss) from continuing operations	11,569	3,030	20,397	1,325
Net income (loss)	10,785	2,606	19,130	102
Net income (loss) attributable to Lansing Trade Group	$ 10,785	$ 2,899	$ 19,130	$ 826