Summary of Significant Accounting Policies (Narrative) (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items]
Deferred debt costs, net of accumulated amortization	$ 22,900,000		$ 22,900,000		$ 22,600,000
Accumulated amortization of deferred debt costs	5,600,000		5,600,000		4,100,000
Amortization of deferred financing costs	759,000	699,000	1,512,000	1,392,000
Trade names value	1,900,000		1,900,000		1,900,000
Intangible assets accumulated amortization	22,500,000		22,500,000		18,400,000
Amortization expense of intangible assets	2,200,000	1,700,000	4,200,000	3,400,000
Percentage revenue from a single customer that is not exceeded			10.00%
Completion And Remedial Services [Member]
Summary Of Significant Accounting Policies [Line Items]
Other intangibles net of accumulated amortization	59,100,000		59,100,000
Fluid Services [Member]
Summary Of Significant Accounting Policies [Line Items]
Other intangibles net of accumulated amortization	15,200,000		15,200,000
Well Servicing [Member]
Summary Of Significant Accounting Policies [Line Items]
Other intangibles net of accumulated amortization	6,000,000		6,000,000
Contract Drilling
Summary Of Significant Accounting Policies [Line Items]
Other intangibles net of accumulated amortization	4,000,000		4,000,000
Customer Relationships
Summary Of Significant Accounting Policies [Line Items]
Gross carrying amount of intangible assets subject to amortization	92,900,000		92,900,000		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	10,800,000		10,800,000		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		$ 1,100,000
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 [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives			3 years
Well Service Units And Equipment | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives			15 years