Quarterly report pursuant to Section 13 or 15(d)

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

v2.4.0.6
Reportable Segments - Results of Operations by Reportable Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Revenues:    
Revenues $ 167,155 $ 176,569
Operating gross margin:    
Total operating gross margin 20,597 54,018
General and administrative expense (12,883) (5,497)
Gain on disposition of assets, net 1,148 492
Total operating income 8,862 49,013
Interest expense (10,006) (8,037)
Interest income 59 26
Changes in fair value of derivative positions 37 (49)
Other 116 16
Income before income taxes (932) 40,969
Rental Tools [Member]
    
Revenues:    
Revenues 57,082 66,284
Operating gross margin:    
Total operating gross margin 21,507 33,602
U.S. Barge Drilling [Member]
    
Revenues:    
Revenues 29,865 27,835
Operating gross margin:    
Total operating gross margin 8,758 7,157
U.S. Drilling [Member]
    
Revenues:    
Revenues 11,635  
Operating gross margin:    
Total operating gross margin (4,052) (1,547)
International Drilling [Member]
    
Revenues:    
Revenues 64,650 78,750
Operating gross margin:    
Total operating gross margin (5,945) 14,559
Technical Services [Member]
    
Revenues:    
Revenues 3,923 3,700
Operating gross margin:    
Total operating gross margin $ 329 $ 247