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Summary of Significant Accounting Policies (Impact of New Accounting Principles, Income) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue	$ 98,596	$ 70,622
Cost of sales	23,788	17,730
Gross profit	74,808	52,892
Selling, general, and administrative	60,125	44,283
Income from operations	14,683	8,609
Other income (expense)
Interest and dividend income, net	249	63
Other income (expense)	(1)	39
Nonoperating income (expense)	248	102
Income from continuing operations before income taxes	14,931	8,711
Provision for income taxes on continuing operations	2,709	2,566
Net income	$ 12,222	$ 6,145
Basic earnings per share
Earnings Per Share, Basic	$ 1.02	$ 0.52
Diluted earnings per share
Earnings Per Share, Diluted	$ 1.01	$ 0.51
Weighted average shares outstanding -
Basic	12,030	11,901
Diluted	12,139	12,009
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue	$ 97,254
Cost of sales	23,521
Gross profit	73,733
Selling, general, and administrative	59,523
Income from operations	14,210
Other income (expense)
Interest and dividend income, net	249
Other income (expense)	(1)
Nonoperating income (expense)	248
Income from continuing operations before income taxes	14,458
Provision for income taxes on continuing operations	2,608
Net income	$ 11,850
Basic earnings per share
Earnings Per Share, Basic	$ 0.99
Diluted earnings per share
Earnings Per Share, Diluted	$ 0.98
Weighted average shares outstanding -
Basic	12,030
Diluted	12,139
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue	$ 1,342
Cost of sales	(267)
Gross profit	1,075
Selling, general, and administrative	(602)
Income from operations	473
Other income (expense)
Income from continuing operations before income taxes	473
Provision for income taxes on continuing operations	(101)
Net income	$ 372
Basic earnings per share
Earnings Per Share, Basic	$ 0.03
Diluted earnings per share
Earnings Per Share, Diluted	$ 0.03

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