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Interest Income and Other (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Interest and Other Income [Line Items]                      
Interest income                 $ 5,439 $ 6,350 $ 6,200
Foreign exchange transaction gains (losses), net                 (2,326) 250 (560)
Other                 (1,365) (941) 664
Interest income and other $ 46 $ 1,152 $ (387) $ 937 $ 1,156 $ 1,584 $ (363) $ 3,282 $ 1,748 $ 5,659 $ 6,304