Shareholders Equity and Stock Options (Time Based Restricted Stock Awards) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding at period beginning, weighted average grant date fair value	$ 40.58	$ 37.54	$ 36.63
Awards granted, weighted average grant date fair value	$ 0.00	$ 41.27	$ 46.29
Stock issued, weighted average grant date fair value	$ 37.82	$ 42.97	$ 33.61
Awards forfeited or expired, weighted average grant date fair value	$ 39.04	$ 43.57	$ 30.77
Outstanding at period end, weighted average grant date fair value	$ 43.23	$ 40.58	$ 37.54
Time Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Non-vested awards outstanding, beginning balance	115,139	86,707	2,500
Awards granted	156,665	51,790	84,667
Stock issued	(12,436)	(16,620)	0
Awards forfeited or expired	(28,342)	(6,738)	(460)
Non-vested awards outstanding, ending balance	231,026	115,139	86,707
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding at period beginning, weighted average grant date fair value	$ 43.27	$ 44.55	$ 20.01
Awards granted, weighted average grant date fair value	$ 51.78	$ 40.99	$ 45.29
Stock issued, weighted average grant date fair value	$ 43.97	$ 41.64	$ 0.00
Awards forfeited or expired, weighted average grant date fair value	$ 47.07	$ 46.21	$ 47.89
Outstanding at period end, weighted average grant date fair value	$ 48.54	$ 43.27	$ 44.55