Annual report pursuant to Section 13 and 15(d)

Supplementary Information - Additional Information (Detail)

v2.4.0.8
Supplementary Information - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Supplemental Financial Information [Line Items]    
Deferred mobilization fees $ 8.1 $ 1.6
Accrued interest expense 16.8 9.7
Worker's compensation liabilities 2.7 2.3
Accrued payroll and payroll taxes 33.5 26.0
Other Long Term Obligations [Member]
   
Supplemental Financial Information [Line Items]    
Worker's compensation liabilities $ 3.0 $ 2.5