Stock-Based Compensation and Stock Options - Stock Options Outstanding and Exercisable (Detail) - $ / shares	3 Months Ended
	Jun. 30, 2019	Apr. 01, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options	1,000,830	1,058,411	1,058,411	1,063,254	1,064,439
Weighted Average Remaining Contractual Life	3 years 5 months 1 day
Outstanding Options – Weighted Average Exercise Price	$ 47.05	$ 45.17	$ 45.17	$ 40.43	$ 39.45
Exercisable Options – Number of Exercisable Options	379,869
Exercisable Options – Weighted Average Exercise Price	$ 36.21
Range of Exercise Price, $12.71 to $34.78 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, lower limit	12.71
Range of Exercise Price, upper limit	$ 34.78
Number of Outstanding Options	262,396
Weighted Average Remaining Contractual Life	2 years 3 months 7 days
Outstanding Options – Weighted Average Exercise Price	$ 27.56
Exercisable Options – Number of Exercisable Options	201,204
Exercisable Options – Weighted Average Exercise Price	$ 26.12
Range of Exercise Price, $34.79 to $49.40 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, lower limit	34.79
Range of Exercise Price, upper limit	$ 49.40
Number of Outstanding Options	297,264
Weighted Average Remaining Contractual Life	3 years 4 months 13 days
Outstanding Options – Weighted Average Exercise Price	$ 45.64
Exercisable Options – Number of Exercisable Options	136,418
Exercisable Options – Weighted Average Exercise Price	$ 44.60
Range of Exercise Price, $49.41 to $59.32 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, lower limit	49.41
Range of Exercise Price, upper limit	$ 59.32
Number of Outstanding Options	366,195
Weighted Average Remaining Contractual Life	4 years 3 days
Outstanding Options – Weighted Average Exercise Price	$ 58.02
Exercisable Options – Number of Exercisable Options	42,247
Exercisable Options – Weighted Average Exercise Price	$ 57.15
Range of Exercise Price, $59.33 to $70.24 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, lower limit	59.33
Range of Exercise Price, upper limit	$ 70.24
Number of Outstanding Options	74,975
Weighted Average Remaining Contractual Life	4 years 8 months 15 days
Outstanding Options – Weighted Average Exercise Price	$ 67.28
Exercisable Options – Number of Exercisable Options	0
Exercisable Options – Weighted Average Exercise Price	$ 0