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Severance and Other Charges (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2015
USD ($)
position
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Restructuring Cost and Reserve [Line Items]          
Severance and other charges   $ 1,049 $ 0 $ 13,022 $ 0
Accelerated stock-based compensation expense   1,000   2,300  
Restructuring Reserve [Roll Forward]          
Beginning balance, March 31, 2015   11,973      
Increase in accrual   27      
Decrease in accrual   (1,345)      
Severance and other payments   (3,829)      
Ending balance, June 30, 2015 $ 11,973 6,826   6,826  
Minimum          
Restructuring Cost and Reserve [Line Items]          
Expected number of positions eliminated | position 400        
Maximum          
Restructuring Cost and Reserve [Line Items]          
Expected number of positions eliminated | position 600        
Restructuring Charges          
Restructuring Cost and Reserve [Line Items]          
Severance and other charges   13,000   13,000  
International Services          
Restructuring Reserve [Roll Forward]          
Beginning balance, March 31, 2015   372      
Increase in accrual   0      
Decrease in accrual   0      
Severance and other payments   (187)      
Ending balance, June 30, 2015 $ 372 185   185  
U.S. Services          
Restructuring Reserve [Roll Forward]          
Beginning balance, March 31, 2015   10,743      
Increase in accrual   0      
Decrease in accrual   (1,345)      
Severance and other payments   (2,757)      
Ending balance, June 30, 2015 10,743 6,641   6,641  
Tubular Sales          
Restructuring Reserve [Roll Forward]          
Beginning balance, March 31, 2015   858      
Increase in accrual   27      
Severance and other payments   (885)      
Ending balance, June 30, 2015 $ 858 $ 0   $ 0