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Other Comprehensive Income (Loss) - Schedule of Changes in Accumulated Other Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Components Of Other Comprehensive Income Loss [Line Items]    
Marketable securities, Balance at beginning of year $ 105,419 $ 186,451
Marketable securities, Unrealized gain (loss) arising during the year 33,901 (25,875)
Marketable securities, Balance at end of year 139,320 160,576
Currency translation, Balance at beginning of year (135,165) (133,041)
Other comprehensive income (loss) (5,390) 4,022
Currency translation, Balance at end of year (140,555) (129,019)
Balance at beginning of year (95,253) (4,724)
Other comprehensive income (loss) 29,066 (21,426)
Balance at end of year (66,187) (26,150)
Defined Benefit Pension Plans [Member]
    
Components Of Other Comprehensive Income Loss [Line Items]    
Balance at beginning of year (66,402) (59,478)
Other comprehensive income (loss) - amortization of prior service cost and net losses included in net periodic pension cost 699 565
Balance at end of year (65,703) (58,913)
OPEB [Member]
    
Components Of Other Comprehensive Income Loss [Line Items]    
Balance at beginning of year 895 1,344
Other comprehensive income (loss) - amortization of prior service cost and net losses included in net periodic pension cost (144) (138)
Balance at end of year $ 751 $ 1,206