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Revenue (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Revenue [Abstract]                      
Rental Revenue Oil and Gas Services Equipment                 $ 62,042 $ 67,938 $ 63,610
Differentiation of revenue and cost of revenue                      
Revenue: Product                 282,639 224,777 181,417
Revenue: Service                 26,384 20,113 13,758
Total revenues 100,848 98,388 93,586 78,243 76,702 78,628 78,303 79,195 371,065 312,828 258,785
Cost of Revenue: Product                 180,800 135,367 115,875
Cost of Revenue: Rentals                 24,987 30,618 25,971
Cost of Revenue: Service                 9,916 8,051 4,997
Cost of Revenue: Depreciation                 7,835 7,173 6,122
Total cost of revenue                 $ 223,538 $ 181,209 $ 152,965