Cash Dividends (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended		12 Months Ended
	May 02, 2016	Jan. 26, 2016	Jan. 28, 2015	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Stockholders' Equity Note [Abstract]
Common Stock, Dividends, Per Share, Declared	$ 0.05	$ 0.05	$ 0.15			$ 0.00	$ 0.10	$ 0.60
Payments of Dividends				$ 8,200	$ 8,200	$ 222	$ 16,583	$ 98,307