Goodwill and Other Intangible Assets (Changes in Carrying Amount of Goodwill) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Balance as of December 31, 2014		$ 78,011
Balance as of March 31, 2015	78,011	78,011
Completion and Remedial Services
Goodwill [Line Items]
Balance as of December 31, 2014	78,011
Goodwill additions
Balance as of March 31, 2015	$ 78,011