Stock-Based Compensation and Stock Awards - Schedule of Option Activity (Detail)	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Number of Options
Options Outstanding, Beginning Balance (in shares) | shares	280,212
Granted (in shares) | shares	0
Exercised (in shares) | shares	(35,375)
Forfeited (in shares) | shares	(20,750)
Options Outstanding, Ending Balance (in shares) | shares	224,087
Options Exercisable (in shares) | shares	224,087
Weighted Average Price
Weighted Average Price Outstanding, Beginning Balance (in dollars per share) | $ / shares	$ 59.84
Granted (in dollars per share) | $ / shares	0.00
Exercised (in dollars per share) | $ / shares	31.59
Forfeited (in dollars per share) | $ / shares	67.71
Weighted Average Price Outstanding, Ending Balance (in dollars per share) | $ / shares	63.57
Weighted Average Price Exercisable (in dollars per share) | $ / shares	$ 63.57
Aggregate Intrinsic Value (in millions)
Aggregate intrinsic value Outstanding | $	$ 0.00
Aggregate intrinsic value Exercisable | $	$ 0.00
Weighted Average Remaining Contractual Life (in years)
Weighted Average Remaining Contractual Life Outstanding (in years)	2 years 1 month 6 days
Weighted Average Remaining Contractual Life Exercisable (in years)	2 years 1 month 6 days