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Schedule of Tax Effects Allocated to each Component of Other Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Other Comprehensive Income (Loss) [Line Items]        
Foreign currency translation adjustment $ 4,731   $ (109)  
Unrealized (loss) gain on available-for-sale securities 28 (37) 51 (33)
Income tax (benefit) expense 13 (14) 24 (13)
Unrealized (loss) gain on available-for-sale securities, net of tax 15 (23) 27 (20)
Unrealized gain on derivative instrument   124   357
Income tax expense   47   136
Unrealized gain on derivative instrument, net of tax   77   221
Other comprehensive (loss) income $ 4,746 $ 54 $ (82) $ 201