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Acquisitions - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended |  | 6 Months Ended | 0 Months Ended |  | 0 Months Ended |  |  |  | 0 Months Ended |  |  |  | 0 Months Ended |
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Mar. 31, 2013 | Mar. 31, 2013 | Apr. 01, 2012 | Sep. 30, 2012 | Mar. 31, 2013 Minimum [Member] | Mar. 31, 2013 Maximum [Member] | Mar. 31, 2013 VOBA [Member] | Mar. 31, 2013 Technology assets [Member] Minimum [Member] | Mar. 31, 2013 Technology assets [Member] Maximum [Member] | Mar. 31, 2013 Customer relationships [Member] Minimum [Member] | Mar. 31, 2013 Customer relationships [Member] Maximum [Member] | Dec. 17, 2012 HHI Business [Member] | Mar. 31, 2013 HHI Business [Member] | Dec. 17, 2012 HHI Business [Member] Technology assets [Member] | Dec. 17, 2012 HHI Business [Member] Technology assets [Member] Minimum [Member] | Dec. 17, 2012 HHI Business [Member] Technology assets [Member] Maximum [Member] | Dec. 17, 2012 HHI Business [Member] Trade name license agreement [Member] | Dec. 17, 2012 HHI Business [Member] Trade name license agreement [Member] Minimum [Member] | Dec. 17, 2012 HHI Business [Member] Trade name license agreement [Member] Maximum [Member] | Dec. 17, 2012 HHI Business [Member] Trade name [Member] | Dec. 17, 2012 HHI Business [Member] Trade name [Member] Minimum [Member] | Dec. 17, 2012 HHI Business [Member] Trade name [Member] Maximum [Member] | Dec. 17, 2012 HHI Business [Member] Customer relationships [Member] | Dec. 17, 2012 HHI Business [Member] Trademarks and trade names [Member] | Dec. 17, 2012 HHI Business [Member] Trademarks and trade names [Member] Minimum [Member] | Dec. 17, 2012 HHI Business [Member] Trademarks and trade names [Member] Maximum [Member] | Dec. 17, 2012 HHI Business [Member] Business Combination Measurement Period Adjustment [Member] | Mar. 31, 2013 Shaser Biosciences, Inc. [Member] | Nov. 08, 2012 Shaser Biosciences, Inc. [Member] | Nov. 08, 2012 Shaser Biosciences, Inc. [Member] Non-controlling Interest [Member] | Nov. 08, 2012 Shaser Biosciences, Inc. [Member] Technology assets [Member] | Nov. 08, 2012 Shaser Biosciences, Inc. [Member] Call Option exercisable between January 1, 2017 and March 31, 2017 [Member] | Mar. 31, 2013 Shaser Biosciences, Inc. [Member] Business Combination Measurement Period Adjustment [Member] | Feb. 14, 2013 EXCO/HGI Partnership [Member] EXCO [Member] | Feb. 14, 2013 EXCO/HGI Partnership [Member] HGI [Member] | Feb. 14, 2013 EXCO/HGI Partnership [Member] HGI Energy Holdings, LLC [Member] | Feb. 14, 2013 EXCO/HGI Partnership [Member] EXCO/HGI General Partner [Member] | Feb. 14, 2013 EXCO/HGI Partnership [Member] | Mar. 05, 2013 Cotton-Valley Oil and Gas Properties [Member] | Mar. 05, 2013 Cotton-Valley Oil and Gas Properties [Member] HGI [Member] | Mar. 05, 2013 Cotton-Valley Oil and Gas Properties [Member] EXCO/HGI Partnership [Member] | Apr. 06, 2011 FGL [Member] | Mar. 31, 2013 FGL [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Negotiated sales price paid |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 1,434,000,000 | 1,434,000,000 |  | 694,200,000 |  |  |  |  |  |  |  | 662,200,000 | 682,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,100,000 | 65,600,000 | 63,900,000 |  |  |  | 1,700,000 |  |  |  |  |  |  |  |  |  |
Deferred tax liability - long-term |  |  |  |  |  |  |  |  |  |  |  | 104,700,000 | 115,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  | 104,500,000 | 99,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,200,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory |  |  |  |  |  |  |  |  |  |  |  | 207,100,000 | 204,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,400,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory adjustment to fair value |  |  |  |  |  |  |  |  |  |  |  | 31,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net adjustment to fair value |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible asset |  |  |  |  |  |  |  |  |  |  |  | 470,000,000 | 470,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 32,800,000 | 35,500,000 |  |  |  | (2,700,000) |  |  |  |  |  |  |  |  |  |
Estimated sales growth rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% | 31.00% |  | 2.50% | 5.00% |  | 2.50% | 5.00% | 3.00% |  | 2.50% | 5.00% |  |  |  | 3.00% | 3.00% |  |  |  |  |  |  |  |  |  |  |  |
Customer retention rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 95.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Income tax rate | 35.00% | 35.00% |  |  |  |  |  |  |  |  |  |  |  | 35.00% |  |  | 35.00% |  |  | 35.00% |  |  | 35.00% | 35.00% |  |  |  |  |  | 35.00% | 35.00% |  |  |  |  |  |  |  |  |  |  |  |
Discounted rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.00% |  |  | 12.00% |  |  | 12.00% |  |  | 12.00% | 12.00% |  |  |  |  |  | 12.00% | 11.00% |  |  |  |  |  |  |  |  |  |  |  |
Carrying value, intangible asset |  |  |  |  |  |  |  |  |  |  |  |  |  | 51,000,000 |  |  | 12,000,000 |  |  | 3,000,000 |  |  | 74,000,000 | 330,000,000 |  |  |  |  |  |  | 32,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Amortization period, intangible asset |  |  |  |  | 1 year | 20 years | 5 years 2 months 0 days | 4 years | 17 years | 15 years | 20 years |  |  |  |  |  | 5 years |  |  | 8 years |  |  | 20 years |  |  |  |  |  |  |  | 13 years |  |  |  |  |  |  |  |  |  |  |  |
Royalty rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% | 5.00% | 4.00% |  |  | 3.50% |  |  |  |  | 3.00% | 5.00% |  |  |  |  | 10.50% |  |  |  |  |  |  |  |  |  |  |  |
Expected terminal year growth rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining legal life |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax liabilities, net |  |  |  |  |  |  |  |  |  |  |  | 122,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Percentage Of Equity Interests Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 56.00% |  |  | 44.00% |  | 24.50% | 74.50% | 73.50% | 2.00% |  |  |  |  |  |
Trailing revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Adjusted trailing EBITDA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 700.00% |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,000,000 |  |  |  | 119,100,000 |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 725,000,000 | 348,300,000 |  |  | 573,300,000 |  |  |  |  |
Preliminary working capital and other adjustments |  |  |  |  |  |  |  |  |  |  |  | (10,600,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (400,000) |  |  |  |  |  | 32,500,000 |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  | 629,400,000 | 611,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | (17,900,000) | 23,000,000 | 24,700,000 |  |  |  | (1,700,000) |  | 692,500,000 |  |  | 516,100,000 | 130,900,000 | 130,900,000 | 97,500,000 |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Oil And Natural Gas Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 697,300,000 |  |  | 519,500,000 |  | 138,400,000 | 103,100,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Gas Gathering Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,500,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Asset Retirement Obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,500,000 |  |  | 5,600,000 |  |
Cash consideration |  | 1,903,500,000 | 185,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 350,000,000 |
Cash consideration re-characterized as expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |
Reduction in purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |
Insurance obligations under annuity contract |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000,000 |
Maximum amount of asset securing reinsurance obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000,000 |
Maximum amount required to pay under Front Street Reinsurance Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |
Fair value assigned to the contingent purchase price reduction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Estimated a fair value for reduction in purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 41,000,000

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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) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 44 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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