Acquisitions (Detail) (USD $) In Thousands, unless otherwise specified				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2010 Rocky Mountain Cementers, Inc.	Dec. 31, 2010 New Tech Systems, Inc	Dec. 31, 2010 Taylor Rig, LLC	Dec. 31, 2010 Platinum Pressure Services, Inc.	Dec. 31, 2011 Lone Star Anchor Trucking, Inc.	Dec. 31, 2011 Maverick Companies	Dec. 31, 2011 Pat's P&A, Inc.	Dec. 31, 2011 Cryogas Services Llp	Dec. 31, 2012 Mayo Marrs Casing Pulling, Inc.	Dec. 31, 2012 SPA Victoria, LP	Dec. 31, 2012 Surface Stac, Inc.	Dec. 31, 2012 Salt Water Disposal of North Dakota LLC
Business Acquisition [Line Items]
Closing Date				Mar. 01, 2010	Apr. 20, 2010	May 03, 2010	Dec. 16, 2010	Jul. 07, 2011	Jul. 08, 2011	Aug. 01, 2011	Sep. 08, 2011	Jan. 13, 2012	Mar. 16, 2012	May 15, 2012	Dec. 19, 2012
Total Cash Paid (net of cash acquired)	$ 84,966	$ 216,412	$ 50,263	$ 687	$ 900	$ 8,734	$ 39,942	$ 10,102	$ 186,251	$ 8,974	$ 11,085	$ 6,644	$ 11,948	$ 23,184	$ 43,190