Accumulated Other Comprehensive Income (Loss) (Other Comprehensive Income (Loss) Reclassification Adjustments) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net unrealized gains (losses), Total other comprehensive income (loss), net of tax	$ 13,902	$ (40,492)	$ 25,804	$ (40,745)
Foreign currency translation adjustment, Total other comprehensive income (loss), net of tax	11,612	(9,794)	5,572	(16,616)
Pension benefit adjustment, Total other comprehensive income (loss), net of tax	(3,892)	(4,143)	(7,783)	(8,287)
Pretax change before reclassifications	41,430	(73,610)	57,525	(73,238)
Reclassifications out of AOCI	(471)	2,215	3,729	2,558
Tax effect	(11,416)	24,640	(21,660)	21,626
Other comprehensive income (Note 15)	29,543	(46,755)	39,594	(49,054)
Net Unrealized Gains (Losses) on Securities
Net unrealized gains (losses) on securities, Pretax change before reclassifications	29,818	(63,816)	51,953	(56,622)
Net unrealized gains (losses) on securities, Reclassifications out of AOCI	(6,840)	(4,691)	(9,009)	(11,254)
Net unrealized gains (losses) on securities, Tax effect	(8,939)	27,403	(16,705)	27,151
Net unrealized gains (losses), Total other comprehensive income (loss), net of tax	14,039	(41,104)	26,239	(40,725)
Tax effect			(16,705)
Foreign Currency Translation Adjustment
Foreign currency translation adjustment	11,612	(9,794)	5,572	(16,616)
Foreign currency translation adjustment, Total other comprehensive income (loss), net of tax	11,612	(9,794)	5,572	(16,616)
Pension Benefit Adjustment
Pension benefit adjustment, Reclassifications out of AOCI	6,369	6,906	12,738	13,812
Pension benefit adjustment, Tax effect	(2,477)	(2,763)	(4,955)	(5,525)
Pension benefit adjustment, Total other comprehensive income (loss), net of tax	3,892	4,143	7,783	8,287
Tax effect			$ (4,955)