Discontinued Operations (Summarized Results from Discontinued Operations) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Discontinued Operations and Disposal Groups [Abstract]
Revenues	$ 1,377	$ 13,805	$ 5,647	$ 24,236
Cost of sales	(1,521)	(69,874)	(6,485)	(81,028)
Other operating expenses	(1,066)	(2,242)	(2,389)	(7,008)
Loss from discontinued operations before income taxes	(1,210)	(58,311)	(3,227)	(63,800)
Gain (loss) on disposal before income taxes	(3,596)	(322)	(14,573)	854
Income tax benefit (expense)	2,758	21,641	7,536	23,234
Loss from discontinued operations, net of taxes	$ (2,048)	$ (36,992)	$ (10,264)	$ (39,712)