Goodwill and Other Intangible Asset Data - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Goodwill And Other Intangible Assets [Line Items]
Intangible asset commitments accrued	$ 3,500,000	$ 1,232,000	$ 3,497,000
Minimum [Member]
Goodwill And Other Intangible Assets [Line Items]
Estimated useful life of Intangible Assets	5 years
Maximum [Member]
Goodwill And Other Intangible Assets [Line Items]
Estimated useful life of Intangible Assets	9 years
Patents And Other Intellectual Property [Member]
Goodwill And Other Intangible Assets [Line Items]
Acquired intangible assets	31,157,000	6,232,000
Intangible asset commitments accrued amount		$ 5,000,000