Goodwill and Other Intangible Assets (Changes in Carrying Amount of Goodwill) (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015
Goodwill [Line Items]
Balance as of December 31, 2014		$ 78,011
Goodwill Impairment	$ (81,877)	(81,877)
Completion and Remedial Services
Goodwill [Line Items]
Balance as of December 31, 2014		78,011
Goodwill adjustments		3,866
Goodwill Impairment		$ (81,877)
Balance as of September 30, 2015