Other Intangible Assets, Changes in Net Carrying Amount (Detail) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Gross amount
Other intangible assets, beginning		$ 34,256,000
Other intangible assets acquired during the period		769,000
Foreign currency translation effect on balances		(58,000)
Other intangible assets, ending	34,967,000	34,967,000
Accumulated amortization
Other intangible assets, beginning		(1,206,000)
Other intangible assets acquired during the period
Amortization expense	(652,000)	(1,929,000)
Foreign currency translation effect on balances		1,000
Other intangible assets, ending	$ (3,134,000)	$ (3,134,000)