Quarterly report pursuant to Section 13 or 15(d)

Reportable Segments - Results of Operations by Reportable Segment (Detail)

v2.4.0.8
Reportable Segments - Results of Operations by Reportable Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Revenues:    
Revenues $ 229,225 $ 167,135
Operating gross margin:    
Total operating gross margin 28,863 20,877
General and administrative expense (8,964) [1] (12,845) [1]
Gain (loss) on disposition of assets, net (129) 1,148
Total operating income 19,770 9,180
Interest expense (12,039) (10,006)
Interest income 32 59
Loss on extinguishment of debt (29,673) 0
Other 895 (165)
Loss before income taxes (21,015) (932)
Rental Tools [Member]
    
Revenues:    
Revenues 80,506 [2] 57,082 [2]
Operating gross margin:    
Total operating gross margin 13,345 [3] 21,507 [3]
U.S. Barge Drilling [Member]
    
Revenues:    
Revenues 30,490 [2] 29,865 [2]
Operating gross margin:    
Total operating gross margin 7,824 [3] 8,758 [3]
U.S. Drilling [Member]
    
Revenues:    
Revenues 19,417 [2] 11,635 [2]
Operating gross margin:    
Total operating gross margin 1,641 [3] (4,052) [3]
International Drilling [Member]
    
Revenues:    
Revenues 85,469 [2] 64,650 [2]
Operating gross margin:    
Total operating gross margin 5,477 [3] (5,645) [3]
Technical Services [Member]
    
Revenues:    
Revenues 13,343 [2] 3,903 [2]
Operating gross margin:    
Total operating gross margin $ 576 [3] $ 309 [3]
[1] 1) General and administration expenses for field operations are included in operating expenses.
[2] For the three months ended March 31, 2014, our largest customer, ENL, constituted 17.1% of our total consolidated revenues and approximately 37.6% and 52.4% of our International Drilling and Technical Services segment revenues, respectively. For the three months ended March 31, 2013, our largest customer, ENL, constituted approximately 15.1% of our total consolidated revenues and approximately 38.5% of our International Drilling segment revenues.
[3] Operating gross margin is calculated as revenues less direct operating expenses, including depreciation and amortization expense.