Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, 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
Quarterly Financial Information [Line Items]
Sales	$ 1,083,710	$ 1,102,649	$ 844,800	$ 745,909	$ 900,647	$ 879,939	$ 755,446	$ 673,750	$ 3,777,068	$ 3,209,782	$ 2,656,949
Gross profit	317,108	334,785	252,338	216,648	253,800	259,785	216,749	194,963	1,120,879	925,297	740,583
Net income from continuing operations	108,680	116,921	80,004	75,464	88,064	94,345	69,823	60,078	381,069	312,310	227,575
Net income	$ 108,680	$ 113,144	$ 80,004	$ 75,464	$ 88,064	$ 94,345	$ 69,823	$ 60,078	$ 377,292	$ 312,310	$ 227,575
Diluted net income per share from continuing operations (in dollars per share)	$ 1.56	$ 1.64	$ 1.13	$ 1.07	$ 1.24	$ 1.33	$ 0.98	$ 0.85	$ 5.40	$ 4.40	$ 3.20
Diluted net income per share (in dollars per share)	$ 1.56	$ 1.59	$ 1.13	$ 1.07	$ 1.24	$ 1.33	$ 0.98	$ 0.85	$ 5.35	$ 4.40	$ 3.20