Share-Based Compensation Stock Options Outstanding (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding Options, Shares	1,514,159
Outstanding Options ,Weighted Average Remaining Contractual Life in Years	4 years 3 months 7 days
Outstanding Options, Weighted Average Exercise Price	$ 55.27
Exercisable Options, Shares	680,684
Exercisable Options, Weighted Average Exercise Price	$ 44.50
$19.48 - $31.13
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	$ 19.48
Range of Exercise Prices, maximum	$ 31.13
Outstanding Options, Shares	172,546
Outstanding Options ,Weighted Average Remaining Contractual Life in Years	2 years 3 months 29 days
Outstanding Options, Weighted Average Exercise Price	$ 21.14
Exercisable Options, Shares	172,546
Exercisable Options, Weighted Average Exercise Price	$ 21.14
$31.14 - $48.46
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	$ 31.14
Range of Exercise Prices, maximum	$ 48.46
Outstanding Options, Shares	155,853
Outstanding Options ,Weighted Average Remaining Contractual Life in Years	2 years 11 months 23 days
Outstanding Options, Weighted Average Exercise Price	$ 44.87
Exercisable Options, Shares	116,455
Exercisable Options, Weighted Average Exercise Price	$ 45.08
$48.47 - $49.01
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	$ 48.47
Range of Exercise Prices, maximum	$ 49.01
Outstanding Options, Shares	106,426
Outstanding Options ,Weighted Average Remaining Contractual Life in Years	1 year 4 months 10 days
Outstanding Options, Weighted Average Exercise Price	$ 48.76
Exercisable Options, Shares	105,713
Exercisable Options, Weighted Average Exercise Price	$ 48.76
$49.02 - $54.19
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	$ 49.02
Range of Exercise Prices, maximum	$ 54.19
Outstanding Options, Shares	179,865
Outstanding Options ,Weighted Average Remaining Contractual Life in Years	3 years 4 months 2 days
Outstanding Options, Weighted Average Exercise Price	$ 49.47
Exercisable Options, Shares	113,889
Exercisable Options, Weighted Average Exercise Price	$ 49.44
$54.20 - $60.51
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	$ 54.20
Range of Exercise Prices, maximum	$ 60.51
Outstanding Options, Shares	274,356
Outstanding Options ,Weighted Average Remaining Contractual Life in Years	4 years 4 months 24 days
Outstanding Options, Weighted Average Exercise Price	$ 59.94
Exercisable Options, Shares	108,683
Exercisable Options, Weighted Average Exercise Price	$ 60.08
$60.52 - $63.62
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	$ 60.52
Range of Exercise Prices, maximum	$ 63.62
Outstanding Options, Shares	10,044
Outstanding Options ,Weighted Average Remaining Contractual Life in Years	5 years 3 months 4 days
Outstanding Options, Weighted Average Exercise Price	$ 62.63
Exercisable Options, Shares	2,484
Exercisable Options, Weighted Average Exercise Price	$ 62.66
$63.63 - $64.40
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	$ 63.63
Range of Exercise Prices, maximum	$ 64.40
Outstanding Options, Shares	298,493
Outstanding Options ,Weighted Average Remaining Contractual Life in Years	5 years 3 months 29 days
Outstanding Options, Weighted Average Exercise Price	$ 64.37
Exercisable Options, Shares	60,120
Exercisable Options, Weighted Average Exercise Price	$ 64.37
$64.41 - $73.76
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	$ 64.41
Range of Exercise Prices, maximum	$ 73.76
Outstanding Options, Shares	305,279
Outstanding Options ,Weighted Average Remaining Contractual Life in Years	6 years 3 months 26 days
Outstanding Options, Weighted Average Exercise Price	$ 71.03
Exercisable Options, Shares	794
Exercisable Options, Weighted Average Exercise Price	$ 64.43
$73.77 - $95.64
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	$ 73.77
Range of Exercise Prices, maximum	$ 95.64
Outstanding Options, Shares	11,297
Outstanding Options ,Weighted Average Remaining Contractual Life in Years	6 years 7 months 6 days
Outstanding Options, Weighted Average Exercise Price	$ 86.90
Exercisable Options, Shares	0
Exercisable Options, Weighted Average Exercise Price	$ 0.00