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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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue	$ 117,324	$ 75,729	$ 215,920	$ 146,351
Cost of sales	28,525	18,118	52,313	35,848
Gross profit	88,799	57,611	163,607	110,503
Selling, general, and administrative	71,689	46,301	131,814	90,584
Income from operations	17,110	11,310	31,793	19,919
Other income (expense)
Interest income, net	330	141	579	204
Other income (expense)	179	(3)	178	36
Nonoperating income (expense)	509	138	757	240
Income from operations before income taxes	17,619	11,448	32,550	20,159
Provision for income taxes	3,486	3,864	6,195	6,430
Net income	$ 14,133	$ 7,584	$ 26,355	$ 13,729
Basic earnings per share
Earnings Per Share, Basic	$ 1.17	$ 0.64	$ 2.19	$ 1.15
Diluted earnings per share
Earnings Per Share, Diluted	$ 1.16	$ 0.63	$ 2.17	$ 1.14
Weighted average shares outstanding -
Basic	12,037	11,929	12,032	11,915
Diluted	12,174	12,056	12,129	12,044
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue	$ 119,606		$ 216,860
Cost of sales	28,952		52,473
Gross profit	90,654		164,387
Selling, general, and administrative	72,554		132,077
Income from operations	18,100		32,310
Other income (expense)
Interest income, net	330		579
Other income (expense)	179		178
Nonoperating income (expense)	509		757
Income from operations before income taxes	18,609		33,067
Provision for income taxes	3,696		6,304
Net income	$ 14,913		$ 26,763
Basic earnings per share
Earnings Per Share, Basic	$ 1.24		$ 2.22
Diluted earnings per share
Earnings Per Share, Diluted	$ 1.22		$ 2.21
Weighted average shares outstanding -
Basic	12,037		12,032
Diluted	12,174		12,129
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue	$ (2,282)		$ (940)
Cost of sales	(427)		(160)
Gross profit	(1,855)		(780)
Selling, general, and administrative	(865)		(263)
Income from operations	(990)		(517)
Other income (expense)
Income from operations before income taxes	(990)		(517)
Provision for income taxes	(210)		(109)
Net income	$ (780)		$ (408)
Basic earnings per share
Earnings Per Share, Basic	$ (0.07)		$ (0.03)
Diluted earnings per share
Earnings Per Share, Diluted	$ (0.06)		$ (0.04)

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