Related Party Transactions (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Related Party Transaction [Line Items]
Sales	$ 1,584,266	$ 1,181,374	$ 1,566,964	$ 1,271,970	$ 1,680,641	$ 1,138,402	$ 1,315,834	$ 1,137,133	$ 5,604,574	$ 5,272,010	$ 4,576,331
Gross profit	109,577	73,146	103,229	79,273	91,169	78,316	102,650	85,870	365,225	358,005	352,852
Net income									95,702	75,565	96,825
Current assets	1,221,784				1,297,153				1,221,784	1,297,153
Current liabilities	992,333				992,807				992,333	992,807
Noncontrolling interests	724,421				611,445				724,421	611,445	538,842	464,559
Subsidiaries
Related Party Transaction [Line Items]
Sales									10,232,395	8,080,741	6,935,755
Gross profit									305,016	130,241	165,793
Income from continuing operations									148,583	34,161	90,510
Net income									144,699	32,451	87,673
Current assets	1,406,200				1,266,311				1,406,200	1,266,311
Non-current assets	508,319				326,776				508,319	326,776
Current liabilities	1,040,762				1,062,181				1,040,762	1,062,181
Non-current liabilities	244,910				123,991				244,910	123,991
Noncontrolling interests	$ 20,118				$ 22,745				$ 20,118	$ 22,745