Acquisitions, Goodwill and Intangible Assets - Schedule of Pro-Forma Operating Results (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012
Business Combinations [Abstract]
Net sales	$ 10,044,214	$ 20,049,682
Net income	$ 60,980	$ 151,826
Earnings per share
Basic (in dollars per share)	$ 0.40	$ 1.00
Diluted (in dollars per share)	$ 0.40	$ 0.98