Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	$ 267,562	$ 263,139	$ 530,465	$ 524,066
Inter-segment revenue	0	0	0	0
Segment operating income (loss)	84,134	81,869	166,961	160,906
Total assets (at end of period)	689,128	655,116	689,128	655,116	661,010
Capital expenditures	12,119	9,492	19,787	17,935
Depreciation and amortization	6,318	5,964	12,951	11,989
Reservoir Description [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients			255,845	254,467
Inter-segment revenue			5,532	1,475
Segment operating income (loss)			71,194	71,769
Capital expenditures			11,096	11,853
Depreciation and amortization			7,783	7,224
Production Enhancement [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients			221,273	217,630
Inter-segment revenue			1,181	1,677
Segment operating income (loss)			74,862	71,477
Capital expenditures			2,830	3,939
Depreciation and amortization			3,775	3,614
Reservoir Management [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients			53,347	51,969
Inter-segment revenue			767	823
Segment operating income (loss)			20,268	17,321
Capital expenditures			367	1,036
Depreciation and amortization			605	380
Operating Segment Corporate And Other [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients			0	0
Inter-segment revenue			(7,480)	(3,975)
Segment operating income (loss)			637	339
Capital expenditures			5,494	1,107
Depreciation and amortization			788	771
Operating Segments [Member] | Reservoir Description [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	130,589	129,222
Inter-segment revenue	2,763	1,090
Segment operating income (loss)	36,341	36,918
Total assets (at end of period)	318,370	299,399	318,370	299,399
Capital expenditures	6,280	6,424
Depreciation and amortization	3,935	3,599
Operating Segments [Member] | Production Enhancement [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	110,993	110,199
Inter-segment revenue	384	740
Segment operating income (loss)	37,660	37,239
Total assets (at end of period)	264,784	255,987	264,784	255,987
Capital expenditures	1,755	1,851
Depreciation and amortization	1,880	1,797
Operating Segments [Member] | Reservoir Management [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	25,980	23,718
Inter-segment revenue	347	400
Segment operating income (loss)	9,794	7,475
Total assets (at end of period)	39,795	35,570	39,795	35,570
Capital expenditures	282	517
Depreciation and amortization	366	189
Corporate & Other [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	0	0
Inter-segment revenue	(3,494)	(2,230)
Segment operating income (loss)	339	237
Total assets (at end of period)	66,179	64,160	66,179	64,160
Capital expenditures	3,802	700
Depreciation and amortization	$ 137	$ 379