Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Data [Abstract]
Sales	$ 1,105,618	$ 1,456,000	$ 1,124,327	$ 1,033,345	$ 1,275,000	$ 1,302,343	$ 1,013,959	$ 888,346	$ 4,719,290	$ 4,479,648	$ 3,777,068
Gross profit	310,274	415,623	319,414	293,731	367,573	388,274	304,914	258,417	1,339,042	1,319,178	1,120,879
Net income from continuing operations									455,361	454,029	381,069
Net income	$ 110,682	$ 155,173	$ 100,943	$ 88,563	$ 135,397	$ 140,826	$ 96,905	$ 80,901	$ 455,361	$ 454,029	$ 377,292
Diluted net income per share from continuing operations (in dollars per share)									$ 6.75	$ 6.65	$ 5.40
Diluted net income per share (in dollars per share)	$ 1.66	$ 2.30	$ 1.49	$ 1.30	$ 1.98	$ 2.06	$ 1.42	$ 1.19	$ 6.75	$ 6.65	$ 5.35