Stock-Based Compensation - Summary of Stock Option Transactions and Related Information (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options Outstanding, Beginning Balance (in shares) | shares	473,245
Options, Granted (in shares) | shares	174,874
Options, Exercised (in shares) | shares	(17,175)
Options, Forfeited (in shares) | shares	(42,843)
Options, Expired (in shares) | shares	(39,331)
Options Outstanding, Ending Balance (in shares) | shares	548,770
Options Exercisable, Ending Balance (in shares) | shares	322,018
Weighted Average Exercise Price, Outstanding Beginning Balance (in dollars per share) | $ / shares	$ 79.35
Weighted Average Exercise Price, Granted (in dollars per share) | $ / shares	72.27
Weighted Average Exercise Price, Exercised (in dollars per share) | $ / shares	29.83
Weighted Average Exercise Price, Forfeited (in dollars per share) | $ / shares	92.07
Weighted Average Exercise Price, Expired (in dollars per share) | $ / shares	78.81
Weighted Average Exercise Price, Outstanding Ending Balance (in dollars per share) | $ / shares	77.68
Weighted Average Exercise Price, Exercisable Ending Balance (in dollars per share) | $ / shares	$ 72.72
Weighted Average Remaining Contractual Life - Years, Outstanding Ending Balance	6 years 8 months 12 days
Weighted Average Remaining Contractual Life - Years, Exercisable Ending Balance	5 years 3 months 18 days
Aggregate Intrinsic Value, Outstanding Ending Balance | $	$ 74
Aggregate Intrinsic Value, Exercisable Ending Balance | $	$ 74