Shareholders' Equity And Earnings Per Share (Components Of Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ (31,091)	$ (56,753)	$ (37,332)	$ (63,036)
Other comprehensive income (loss) during the period, net of tax, before reclassifications	(31,072)	21,733	(24,765)	27,699
Amount reclassified from accumulated other comprehensive income (loss), net of tax	292	517	226	834
Other comprehensive income, net of tax	(30,780)	22,250	(24,539)	28,533
Balance at end of period	(61,871)	(34,503)	(61,871)	(34,503)
Accumulated Unrealized Gains (Losses) on Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	6,094	(39,923)	(9,533)	(53,665)
Other comprehensive income (loss) during the period, net of tax, before reclassifications	(32,441)	15,717	(16,496)	29,439
Amount reclassified from accumulated other comprehensive income (loss), net of tax	14	203	(304)	223
Other comprehensive income, net of tax	(32,427)	15,920	(16,800)	29,662
Balance at end of period	(26,333)	(24,003)	(26,333)	(24,003)
Accumulated Unrealized Losses on Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(2,858)	(2,521)	(2,517)	(2,462)
Other comprehensive income (loss) during the period, net of tax, before reclassifications	(147)	(691)	(740)	(1,047)
Amount reclassified from accumulated other comprehensive income (loss), net of tax	278	314	530	611
Other comprehensive income, net of tax	131	(377)	(210)	(436)
Balance at end of period	(2,727)	(2,898)	(2,727)	(2,898)
Accumulated Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(34,327)	(14,309)	(25,282)	(6,909)
Other comprehensive income (loss) during the period, net of tax, before reclassifications	1,516	6,707	(7,529)	(693)
Amount reclassified from accumulated other comprehensive income (loss), net of tax	0	0	0	0
Other comprehensive income, net of tax	1,516	6,707	(7,529)	(693)
Balance at end of period	$ (32,811)	$ (7,602)	$ (32,811)	$ (7,602)