Segment Reporting (Changes in Goodwill by Reportable Segment) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 1,675,154us-gaap_Goodwill	$ 1,636,557us-gaap_Goodwill
Goodwill acquired	18,778us-gaap_GoodwillAcquiredDuringPeriod	39,901us-gaap_GoodwillAcquiredDuringPeriod
Goodwill divested	(143)	(1,304)
Goodwill, Ending Balance	1,693,789us-gaap_Goodwill	1,675,154us-gaap_Goodwill
Western [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance		373,143
Goodwill acquired		521
Goodwill divested		(749)
Goodwill, Ending Balance	372,915	372,915
Central [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	459,054	430,412
Goodwill transferred		(9,196)
Goodwill acquired	1,470	37,838
Goodwill divested	(143)
Goodwill, Ending Balance	460,381	459,054
Eastern [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	380,570	380,561
Goodwill acquired	11,853	564
Goodwill divested		(555)
Goodwill, Ending Balance	392,423	380,570
Exploration and Production [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	462,615	452,441
Goodwill transferred		9,196
Goodwill acquired	5,455	978
Goodwill, Ending Balance	$ 468,070	$ 462,615

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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Amount of transfers of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized among segments.

+ References

No definition available.

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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