Related Party Transactions (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Aggregate summarized financial information
Sales	$ 1,137,133	$ 1,001,674
Gross profit	85,870	78,685
Net income	17,728	17,388
Net income attributable to LTG	18,407	17,266
Subsidiaries [Member]
Aggregate summarized financial information
Sales	1,677,215	1,495,861
Gross profit	34,504	36,535
Income from continuing operations	13,131	14,521
Net income	13,115	13,533
Net income attributable to LTG	$ 12,235	$ 12,090