Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items]
Deferred debt costs, net of accumulated amortization	$ 22,900,000		$ 22,600,000
Accumulated amortization of deferred debt costs	4,900,000		4,100,000
Amortization of deferred financing costs	754,000	693,000
Trade names value	1,900,000		1,900,000
Intangible assets accumulated amortization	20,400,000		18,400,000
Amortization expense of intangible assets	2,000,000	1,700,000
Percentage revenue from a single customer that is not exceeded	10.00%	10.00%
Customer Relationships
Summary Of Significant Accounting Policies [Line Items]
Gross carrying amount of intangible assets subject to amortization	93,400,000		90,100,000
Amortization period of intangible assets, in years	15 years
Noncompete Agreements
Summary Of Significant Accounting Policies [Line Items]
Gross carrying amount of intangible assets subject to amortization	9,200,000		8,000,000
Amortization period of intangible assets, in years	5 years
Other Intangible Assets
Summary Of Significant Accounting Policies [Line Items]
Gross carrying amount of intangible assets subject to amortization	1,100,000		1,100,000
Other Intangible Assets | Completion and Remedial Services
Summary Of Significant Accounting Policies [Line Items]
Other intangibles net of accumulated amortization	59,300,000
Other Intangible Assets | Fluid Services
Summary Of Significant Accounting Policies [Line Items]
Other intangibles net of accumulated amortization	15,600,000
Other Intangible Assets | Well Servicing
Summary Of Significant Accounting Policies [Line Items]
Other intangibles net of accumulated amortization	6,400,000
Other Intangible Assets | Contract Drilling
Summary Of Significant Accounting Policies [Line Items]
Other intangibles net of accumulated amortization	$ 4,100,000
Rig Engineering Plans
Summary Of Significant Accounting Policies [Line Items]
Amortization period of intangible assets, in years	15 years
Well service units and equipment | Minimum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives	3 years
Well service units and equipment | Maximum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives	15 years