Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Taxes [Line Items]
Unrecognized tax benefits, interest expense	$ 900,000
Effective income tax rate from continuing operations	46.10%	33.40%
Discrete item	$ 2,000,000
Maximum
Income Taxes [Line Items]
Unrecognized tax benefits, interest expense		$ 100,000