Stock-Based Compensation (Summary Of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Weighted average contractual life	5 years 10 months 24 days
Number of Options	1,482
Less Than $5.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices	5
Weighted average contractual life	5 years 9 months 18 days
Number of Options	1,312
$5.01 To $10.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices	5.01
Range of Exercise Prices	10
Weighted average contractual life	0 years
$10.01 To $15.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices	10.01
Range of Exercise Prices	15
Weighted average contractual life	6 years 9 months 18 days
Number of Options	160
$15.01 To $20.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices	15.01
Range of Exercise Prices	20
Weighted average contractual life	0 years
Number of Options	0
Twenty Point Zero One and Above [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices	20.01
Weighted average contractual life	1 year 4 months 24 days
Number of Options	10