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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 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Other Comprehensive Income (Loss) [Line Items]        
Foreign currency translation adjustment $ (4,840)   $ (4,840)  
Unrealized (loss) gain on available-for-sale securities (6) (7) 23 4
Income tax (benefit) expense (2) (3) 11 1
Unrealized (loss) gain on available-for-sale securities, net of tax (4) (4) 12 3
Unrealized gain on derivative instrument   118   233
Income tax expense   45   89
Unrealized gain on derivative instrument, net of tax   73   144
Other comprehensive (loss) income $ (4,844) $ 69 $ (4,828) $ 147