Business acquisition contingent consideration, key assumptions, discount rate.

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Business acquisition percentage of equity interests acquired.

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- Definition

Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment, Measurement Basis, Percentage of Total

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- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Asset Retirement Obligations

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- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Proved Developed and Undeveloped Oil and Natural Gas Properties

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Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Unproved Oil and Natural Gas Properties

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Proved Developed and Undeveloped Oil and Natural Gas Properties, Period Increase (Decrease)

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Retention rate.

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- Definition

The aggregate expected value at the end of their useful life of a major finite-lived intangible asset class acquired during the period either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(2)

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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-Publisher FASB

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-SubTopic 30

-Section 30

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- Definition

Amount of assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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- Definition

Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date.

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- Definition

Amount of other liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

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- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

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- Definition

Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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- Definition

In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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-Name Accounting Standards Codification

-Topic 740

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Percentage of assumed long-term growth in revenues, used as an input to measure fair value.

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-Topic 820

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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Acquisitions - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended	0 Months Ended
Acquisitions - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014	Oct. 31, 2014	Nov. 03, 2014	Oct. 01, 2014	Oct. 06, 2014
Business Acquisition [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	0.00%	0.00%
Minimum [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year
Maximum [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years
Trade names [Member] \| Minimum [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life			1 year
Trade names [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life			12 years
Technology assets [Member] \| Minimum [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life			4 years
Technology assets [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life			17 years
Customer relationships [Member] \| Minimum [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life			15 years
Customer relationships [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life			20 years
Compass Production Partners [Member]
Business Acquisition [Line Items]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain				$ 141,200,000.0
Proved Developed and Undeveloped Oil and Natural Gas Properties, Period Increase (Decrease)				145,400,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets, Current				56,100,000
Business Acquisition Percentage Of Equity Interests Acquired				100.00%			26.00%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Unproved Oil and Natural Gas Properties				26,300,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Proved Developed and Undeveloped Oil and Natural Gas Properties				767,500,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable				23,200,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other				1,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Asset Retirement Obligations				36,000,000
Ability Re [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	19,200,000
Payments to Acquire Businesses, Gross					17,900,000
General Partner [Member]
Business Acquisition [Line Items]
Business Acquisition Percentage Of Equity Interests Acquired				100.00%
Tell Manufacturing [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net						30,300,000
Tell Manufacturing [Member] \| Trade names [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles						4,000,000
Tell Manufacturing [Member] \| Customer relationships [Member]
Business Acquisition [Line Items]
Retention Rate						90.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent						38.00%
Business Acquisition Contingent Consideration Key Assumptions Discount Rate						20.00%
Acquired Finite-lived Intangible Asset, Residual Value						$ 8,500,000
Finite-Lived Intangible Asset, Useful Life						13 years
Tell Manufacturing [Member] \| Customer relationships [Member] \| Minimum [Member]
Business Acquisition [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate						2.50%
Tell Manufacturing [Member] \| Customer relationships [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate						7.10%
Cost Approach Valuation Technique [Member] \| Tell Manufacturing [Member]
Business Acquisition [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment, Measurement Basis, Percentage of Total						97.00%
Market Approach Valuation Technique [Member] \| Tell Manufacturing [Member]
Business Acquisition [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment, Measurement Basis, Percentage of Total						3.00%