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Stock-Based Compensation - Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Options
Beginning balance (in shares)	466,677
Granted (in shares)	128,555
Exercised (in shares)	(734)
Canceled (in shares)	(228)
Ending balance (in shares)	594,270	466,677
Exercisable at period end (in shares)	355,222
Weighted Average Exercise Price
Beginning balance (in dollars per share)	$ 61.04
Granted (in dollars per share)	72.85
Exercised (in dollars per share)	64.54
Canceled (in dollars per share)	74.38
Ending balance (in dollars per share)	63.58	$ 61.04
Exercisable (in dollars per share)	$ 56.00
Weighted Average Remaining Contractual Life
Outstanding, weighted average remaining contractual life (in years)	6 years 5 months	5 years 8 months
Exercisable weighted average remaining contractual life (in years)	5 years 2 months
Aggregate Intrinsic Value
Beginning balance	$ 5,917
Granted	112
Exercised	7
Canceled	0
Ending balance	6,027	$ 5,917
Exercisable	$ 6,295

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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