Shareholders' Equity And Earnings Per Share (Components Of 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
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ (61,871)	$ (34,503)	$ (37,332)	$ (63,036)
Other comprehensive income (loss) during the period, net of tax, before reclassifications	12,371	(8,621)	(12,394)	19,078
Amount reclassified from accumulated other comprehensive income (loss), net of tax	407	424	633	1,258
Other comprehensive income, net of tax	12,778	(8,197)	(11,761)	20,336
Balance at end of period	(49,093)	(42,700)	(49,093)	(42,700)
Accumulated Unrealized Gains (Losses) on Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(26,333)	(24,003)	(9,533)	(53,665)
Other comprehensive income (loss) during the period, net of tax, before reclassifications	18,995	812	2,499	30,251
Amount reclassified from accumulated other comprehensive income (loss), net of tax	60	91	(244)	314
Other comprehensive income, net of tax	19,055	903	2,255	30,565
Balance at end of period	(7,278)	(23,100)	(7,278)	(23,100)
Accumulated Unrealized Losses on Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(2,727)	(2,898)	(2,517)	(2,462)
Other comprehensive income (loss) during the period, net of tax, before reclassifications	(287)	252	(1,027)	(795)
Amount reclassified from accumulated other comprehensive income (loss), net of tax	347	333	877	944
Other comprehensive income, net of tax	60	585	(150)	149
Balance at end of period	(2,667)	(2,313)	(2,667)	(2,313)
Accumulated Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(32,811)	(7,602)	(25,282)	(6,909)
Other comprehensive income (loss) during the period, net of tax, before reclassifications	(6,337)	(9,685)	(13,866)	(10,378)
Amount reclassified from accumulated other comprehensive income (loss), net of tax	0	0	0	0
Other comprehensive income, net of tax	(6,337)	(9,685)	(13,866)	(10,378)
Balance at end of period	$ (39,148)	$ (17,287)	$ (39,148)	$ (17,287)