Stock-based Compensation and Outstanding Awards - Significant Assumptions Used to Calculate the Grant Date Fair Market Values of Options Granted (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Valuation Assumptions:
Expected volatility	44.00%	41.20%	50.00%
Risk-free interest rate	1.30%	1.40%	0.90%
Expected dividends (per share)			$ 0.75
Expected term (in years)	4 years 6 months	4 years 6 months	3 years 4 months 24 days