Summary of Significant Accounting Policies (Narrative) (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items]
Deferred debt costs, net of accumulated amortization	$ 23,400,000		$ 23,400,000		$ 23,300,000
Accumulated amortization of deferred debt costs	8,800,000		8,800,000		7,200,000
Amortization of deferred financing costs	806,000	759,000	1,605,000	1,512,000
Trade names value	1,900,000		1,900,000
Intangible assets accumulated amortization	30,900,000		30,900,000		26,600,000
Amortization expense of intangible assets	2,100,000	2,200,000	4,300,000	4,200,000
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	53,100,000		53,100,000
Well Servicing [Member]
Summary Of Significant Accounting Policies [Line Items]
Other intangibles net of accumulated amortization	5,600,000		5,600,000
Fluid Services [Member]
Summary Of Significant Accounting Policies [Line Items]
Other intangibles net of accumulated amortization	10,800,000		10,800,000
Contract Drilling
Summary Of Significant Accounting Policies [Line Items]
Other intangibles net of accumulated amortization	3,600,000		3,600,000
Customer Relationships
Summary Of Significant Accounting Policies [Line Items]
Gross carrying amount of intangible assets subject to amortization	86,900,000		86,900,000		87,100,000
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	12,900,000		12,900,000		13,000,000
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	$ 2,100,000		$ 2,100,000
Amortization period of intangible assets, in years			15 years
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