Stock-Based Compensation and Stock Awards - Summary of RSA Activity (Detail) - Restricted Stock Awards [Member]	12 Months Ended
	Dec. 31, 2016 $ / shares shares
RSA Number of Shares
Nonvested options, Beginning Balance (in shares) | shares	193,596
Granted (in shares) | shares	165,063
Vested (in shares) | shares	(84,513)
Forfeited (in shares) | shares	(4,763)
Nonvested options, Ending Balance (in shares) | shares	269,383
Weighted Average Grant Date Fair Value Per Unit
Nonvested Weighted Average Grant Date Fair Value, Beginning Balance (in dollars per share) | $ / shares	$ 77.91
Granted (in dollars per share) | $ / shares	48.45
Vested (in dollars per share) | $ / shares	84.98
Forfeited (in dollars per share) | $ / shares	80.60
Nonvested Weighted Average Grant Date Fair Value, Ending Balance (in dollars per share) | $ / shares	$ 57.59