Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Trade, allowance for doubtful accounts	$ 178	$ 223
Notes and other, allowance for doubtful accounts	0	0
Seismic data library, accumulated amortization	1,229,789	1,176,828
Property and equipment, accumulated depreciation and amortization	16,880	16,478
Intangible assets, accumulated amortization	$ 48,858	$ 47,826
Common stock, par value per share (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	100	100
Common stock, shares issued (in shares)	100	100
Common stock, shares outstanding (in shares)	100	100