Summary of Significant Accounting Policies (Changes in Carrying Amount of Goodwill) (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Goodwill [Line Items]
Balance as of December 31, 2012	$ 105,836
Goodwill, Period Increase (Decrease)	4,720
Balance as of June 30, 2013	110,556
Completion And Remedial Services [Member]
Goodwill [Line Items]
Balance as of December 31, 2012	79,047
Goodwill, Period Increase (Decrease)	(1,350)
Balance as of June 30, 2013	77,697
Fluid Services [Member]
Goodwill [Line Items]
Balance as of December 31, 2012	20,467
Goodwill, Period Increase (Decrease)	5,770
Balance as of June 30, 2013	26,237
Well Servicing [Member]
Goodwill [Line Items]
Balance as of December 31, 2012	6,322
Goodwill, Period Increase (Decrease)	300
Balance as of June 30, 2013	$ 6,622