Seismic Data Library - Summary of the net book value of the Company’s seismic data library (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Long-Lived Assets Held and Used [Line Items]
Net seismic data library	$ 165,079	$ 195,778
U.S. Offshore [Member]
Long-Lived Assets Held and Used [Line Items]
Net seismic data library	237	237
Unconventional 3D [Member] | U.S. Onshore [Member]
Long-Lived Assets Held and Used [Line Items]
Net seismic data library	117,962	119,489
Unconventional 3D [Member] | Canada [Member]
Long-Lived Assets Held and Used [Line Items]
Net seismic data library	44,855	74,046
Conventional 3D [Member] | U.S. Onshore [Member]
Long-Lived Assets Held and Used [Line Items]
Net seismic data library	1,377	1,585
Conventional 3D [Member] | Canada [Member]
Long-Lived Assets Held and Used [Line Items]
Net seismic data library	199	362
2D [Member] | Canada [Member]
Long-Lived Assets Held and Used [Line Items]
Net seismic data library	$ 449	$ 59