Parker Wellbore Registration of securities issued in business combination transactions

Registration of securities issued in business combination transactions

Supplementary Information - Additional Information (Detail)

Supplementary Information - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Supplemental Financial Information [Line Items]
Deferred mobilization fees	$ 1.6	$ 2.2
Accrued interest expense	9.7	8.1
Worker's compensation liabilities	2.3	3.0
Accrued payroll and payroll taxes	26.0	26.8
Other Long Term Obligations [Member]
Supplemental Financial Information [Line Items]
Worker's compensation liabilities	$ 2.5	$ 3.6

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable for statutory payroll taxes incurred through that date and withheld from employees pertaining to services received from them, including entity's matching share of the employees FICA taxes and contributions to the state and federal unemployment insurance programs.

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