Stock-Based Compensation and Stock Awards - Schedule of Option Activity (Detail) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares
Number of Options
Options Outstanding, Beginning Balance (in shares) | shares	415,122
Granted (in shares) | shares	0
Exercised (in shares) | shares	(54,350)
Forfeited (in shares) | shares	(8,813)
Options Outstanding, Ending Balance (in shares) | shares	351,959
Options Exercisable (in shares) | shares	351,959
Weighted Average Price
Weighted Average Price Outstanding, Beginning Balance (in dollars per share) | $ / shares	$ 55.64
Granted (in dollars per share) | $ / shares	0.00
Exercised (in dollars per share) | $ / shares	40.61
Forfeited (in dollars per share) | $ / shares	67.71
Weighted Average Price Outstanding, Ending Balance (in dollars per share) | $ / shares	57.66
Weighted Average Price Exercisable (in dollars per share) | $ / shares	$ 57.66
Aggregate intrinsic value (in millions)
Aggregate intrinsic value Outstanding | $	$ 2.5
Aggregate intrinsic value Exercisable | $	$ 2.5
Weighted Average Remaining Contractual Life (in years)
Weighted Average Remaining Contractual Life Outstanding (in years)	3 years 6 months 1 day
Weighted Average Remaining Contractual Life Exercisable (in years)	3 years 6 months 1 day