Nature of Operations and Summary of Significant Accounting Policies--Inventories (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Equipment inventory	$ 24,169cpr_EnergyRelatedInventoryEquipment	$ 13,657cpr_EnergyRelatedInventoryEquipment
Oil and natural gas product	2,575us-gaap_EnergyRelatedInventoryPetroleum	3,186us-gaap_EnergyRelatedInventoryPetroleum
Inventory valuation allowance	(1,187)us-gaap_InventoryValuationReserves	(706)us-gaap_InventoryValuationReserves
Inventories, net	$ 25,557us-gaap_InventoryNet	$ 16,137us-gaap_InventoryNet

Amount of valuation reserve for inventory.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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