Accumulated Other Comprehensive Income (Loss) (AOCI) (Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss) including non-controlling interest, Beginning Balance			$ (199,089)
Change in unrealized gains (losses) on securities			(28,421)
Change in foreign currency translation adjustment			(29,210)
Amortization of net actuarial loss			24,596
Amortization of prior service cost			(3,122)
Tax effect	$ 2,266	$ 9,155	833	$ (12,505)
Accumulated other comprehensive income (loss) including non-controlling interest, Ending Balance	(234,413)		(234,413)
Accumulated other comprehensive income (loss), Allocated to the Company	(234,413)		(234,413)		$ (199,106)
Unrealized Gains (Losses) on Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss) including non-controlling interest, Beginning Balance			10,911
Change in unrealized gains (losses) on securities			(28,421)
Tax effect	4,780	9,582	9,047	(7,124)
Accumulated other comprehensive income (loss) including non-controlling interest, Ending Balance	(8,463)		(8,463)
Accumulated other comprehensive income (loss), Allocated to the Company	(8,463)		(8,463)
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss) including non-controlling interest, Beginning Balance			(20,420)
Change in foreign currency translation adjustment			(29,210)
Accumulated other comprehensive income (loss) including non-controlling interest, Ending Balance	(49,630)		(49,630)
Accumulated other comprehensive income (loss), Allocated to the Company	(49,630)		(49,630)
Pension Benefit Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss) including non-controlling interest, Beginning Balance			(189,580)
Amortization of net actuarial loss			24,596
Amortization of prior service cost			(3,122)
Tax effect	(2,514)	$ (427)	(8,214)	$ (5,381)
Accumulated other comprehensive income (loss) including non-controlling interest, Ending Balance	(176,320)		(176,320)
Accumulated other comprehensive income (loss), Allocated to the Company	$ (176,320)		$ (176,320)