Gross Amount of Property and Equipment and Related Accumulated Amortization Recorded Under Capital Leases (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property, plant and equipment under capital lease, gross	$ 190,774	$ 157,063
Less accumulated amortization	63,194	60,455
Property, plant and equipment under capital lease, net	127,580	96,608
Light vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment under capital lease, gross	31,180	28,794
Contract Drilling
Property, Plant and Equipment [Line Items]
Property, plant and equipment under capital lease, gross	4,223
Well Service Units And Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment under capital lease, gross	1,748	1,671
Fluid Services Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment under capital lease, gross	105,932	83,544
Pressure Pumping Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment under capital lease, gross	29,253	24,260
Construction Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment under capital lease, gross	974	1,341
Software
Property, Plant and Equipment [Line Items]
Property, plant and equipment under capital lease, gross	17,120	16,896
Other
Property, Plant and Equipment [Line Items]
Property, plant and equipment under capital lease, gross	$ 344	$ 557