Goodwill and Other Intangible Assets (Narrative) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Goodwill And Intangible Assets [Line Items]
Earnouts		$ 800,000
Adjustments related to foreign acquisition	35,000	(3,902,000)
Amortization expense of intangible assets	$ 32,376,000	$ 19,590,000	$ 17,205,000