Income Taxes (Schedule of Income from Continuing Operations before Income Taxes) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
United States	$ 53,356	$ 64,923	$ 27,463
Foreign	1,583	6,100	6,193
Total income before income taxes	$ 54,939	$ 71,023	$ 33,656