Total Tax Expense on Other Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Components of Taxes Other Than Income [Line Items]
Foreign currency translation adjustments	$ (125)		$ (140)
Tax expense on unrealized gains (losses) on securities	(619)	(765)	(527)	(718)
Tax benefit (expense) on defined benefit pension plans	(4)	(6)	(7)	(5)
Total tax expense on other comprehensive income (loss)	$ (748)	$ (771)	$ (674)	$ (723)