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Schedule of Tax Effects Allocated to Each Component of Other Comprehensive (Loss) Income (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Other Comprehensive Income (Loss) [Line Items]        
Foreign currency translation adjustment $ (8,377) $ (8,666) $ (13,440) $ (8,666)
Unrealized (loss) gain on available-for-sale securities (17) (6) (3) 23
Income tax (benefit) expense (6) (2)   11
Unrealized (loss) gain on available-for-sale securities, net of tax (11) (4) (3) 12
Other comprehensive loss $ (8,388) $ (8,670) $ (13,443) $ (8,654)