Total Tax Benefit (Expense) on Other Comprehensive Income (Loss) (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
Components of Taxes Other Than Income [Line Items]
Foreign currency translation adjustments	$ (15)		$ (15)
Tax benefit (expense) on unrealized gains (losses) on securities	345	(156)	93	46
Tax benefit (expense) on defined benefit pension plans	(3)	6	(4)	1
Total tax benefit (expense) on other comprehensive income (loss)	$ 327	$ (150)	$ 74	$ 47