Accumulated Other Comprehensive Income (Loss) (Other Comprehensive Income Reclassification Adjustments) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Net unrealized gains (losses) on securities, Pretax change before reclassifications	$ 22,333	$ 6,644
Net unrealized gains (losses) on securities, Reclassifications out of AOCI	(2,366)	(6,012)
Net unrealized gains (losses) on securities, Tax effect	(7,767)	(253)
Net unrealized gains (losses), Total other comprehensive income (loss), net of tax	12,200	379
Foreign currency translation adjustment	(6,040)	(6,822)
Foreign currency translation adjustment, Reclassifications out of AOCI
Foreign currency translation adjustment, Tax effect
Accumulated other comprehensive income (loss), Change in foreign currency translation adjustments	(6,040)	(6,822)
Pension benefit adjustment, Pretax change before reclassifications	3,891
Pension benefit adjustment, Reclassifications out of AOCI	6,369	6,906
Pension benefit adjustment, Tax effect	(2,478)	(2,762)
Pension benefit adjustment, Total other comprehensive income (loss), net of tax	(129,193)	4,144	(133,084)
Accumulated other comprehensive income (loss), Pretax change before reclassifications	16,293	(178)
Accumulated other comprehensive income (loss), Reclassifications out of AOCI	4,003	894
Accumulated other comprehensive income (loss), Tax effect	(10,245)	(3,015)
Other comprehensive income (Note 15)	10,051	(2,299)
Accumulated other comprehensive loss	$ (135,486)	$ (2,299)	$ (145,537)