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Fair Value Measurements - Carrying Amounts and Fair Values of Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified

Dec. 31, 2013

Dec. 31, 2012

Commodity swaps, collars and basis swaps

$ 13,654

$ 153,267

Marketable securities

67,766

57,776

Liabilities

Commodity swaps, collars and basis swaps

26,223

7,934

Bank credit facility

(500,000)

(739,000)

Deferred compensation plan

(247,537)

(187,604)

Subordinated debt

(2,640,516)

(2,139,185)

Carrying Value

Commodity swaps, collars and basis swaps

13,654

153,267

Marketable securities

67,766

^[1]

57,776

^[1]

Liabilities

Commodity swaps, collars and basis swaps

(26,223)

(7,934)

Bank credit facility

(500,000)

^[2]

(739,000)

^[2]

Deferred compensation plan

(271,738)

^[3]

(201,889)

^[3]

Fair Value

Commodity swaps, collars and basis swaps

13,654

153,267

Marketable securities

67,766

^[1]

57,776

^[1]

Liabilities

Commodity swaps, collars and basis swaps

(26,223)

(7,934)

Bank credit facility

(500,000)

^[2]

(739,000)

^[2]

Deferred compensation plan

(271,738)

^[3]

(201,889)

^[3]

7.25% Senior Subordinated notes due 2018

Liabilities

Subordinated debt

(250,000)

7.25% Senior Subordinated notes due 2018 | Carrying Value

Liabilities

Subordinated debt

(250,000)

^[2]

7.25% Senior Subordinated notes due 2018 | Fair Value

Liabilities

Subordinated debt

(262,500)

^[2]

8.00% Senior Subordinated notes due 2019

Liabilities

Subordinated debt

(290,516)

(289,185)

8.00% Senior Subordinated notes due 2019 | Carrying Value

Liabilities

Subordinated debt

(290,516)

^[2]

(289,185)

^[2]

8.00% Senior Subordinated notes due 2019 | Fair Value

Liabilities

Subordinated debt

(319,500)

^[2]

(332,250)

^[2]

6.75% Senior Subordinated notes due 2020

Liabilities

Subordinated debt

(500,000)

(500,000)

6.75% Senior Subordinated notes due 2020 | Carrying Value

Liabilities

Subordinated debt

(500,000)

^[2]

(500,000)

^[2]

6.75% Senior Subordinated notes due 2020 | Fair Value

Liabilities

Subordinated debt

(541,250)

^[2]

(542,500)

^[2]

5.75% Senior Subordinated Notes due 2021 | Carrying Value

Liabilities

Subordinated debt

(500,000)

^[2]

(500,000)

^[2]

5.75% Senior Subordinated Notes due 2021 | Fair Value

Liabilities

Subordinated debt

(530,625)

^[2]

(535,000)

^[2]

5.00% Senior Subordinated notes due 2022

Liabilities

Subordinated debt

(600,000)

(600,000)

5.00% Senior Subordinated notes due 2022 | Carrying Value

Liabilities

Subordinated debt

(600,000)

^[2]

(600,000)

^[2]

5.00% Senior Subordinated notes due 2022 | Fair Value

Liabilities

Subordinated debt

(588,750)

^[2]

(627,000)

^[2]

5.00% Senior Subordinated notes due 2023

Liabilities

Subordinated debt

(750,000)

5.00% Senior Subordinated notes due 2023 | Carrying Value

Liabilities

Subordinated debt

(750,000)

^[2]

5.00% Senior Subordinated notes due 2023 | Fair Value

Liabilities

Subordinated debt

$ (732,188)

^[2]

[1]	Marketable securities are held in our deferred compensation plans that are actively traded on major exchanges.
[2]	The book value of our bank debt approximates fair value because of its floating rate structure. The fair value of our senior subordinated notes is based on end of period market quotes, which are Level 2 inputs.
[3]	The fair value of our deferred compensation plan is updated based on the closing price on the balance sheet date.

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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