Long-Term Debt (Priority Guarantee) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Total Consolidated Secured Debt	$ 12,575,294us-gaap_SecuredDebt	$ 12,818,693us-gaap_SecuredDebt
Priority Guarantee Notes [Member]
Debt Instrument [Line Items]
Total Consolidated Secured Debt	5,324,815	4,324,815
Priority Guarantee Notes [Member] \| 9% Notes Due 2019 [Member]
Debt Instrument [Line Items]
Total Consolidated Secured Debt	1,999,815	1,999,815
Maturity date	Dec. 15, 2019
Stated interest rate	9.00%
Debt Instrument, Interest Rate Terms	Payable semi-annually in arrears on June 15 and December 15 of each year
Priority Guarantee Notes [Member] \| 9% Notes Due 2021 [Member]
Debt Instrument [Line Items]
Total Consolidated Secured Debt	1,750,000	1,750,000
Maturity date	Mar. 01, 2021
Stated interest rate	9.00%
Debt Instrument, Interest Rate Terms	Payable semi-annually in arrears on March 1 and September 1 of each year
Priority Guarantee Notes [Member] \| 11.25% Notes Due 2021 [Member]
Debt Instrument [Line Items]
Total Consolidated Secured Debt	575,000	575,000
Maturity date	Mar. 01, 2021
Stated interest rate	11.25%
Debt Instrument, Interest Rate Terms	Payable semi-annually on March 1 and September 1 of each year
Priority Guarantee Notes [Member] \| 9% Notes Due 2022 [Member]
Debt Instrument [Line Items]
Total Consolidated Secured Debt	$ 1,000,000	$ 0
Maturity date	Sep. 15, 2022
Stated interest rate	9.00%
Debt Instrument, Interest Rate Terms	Payable semi-annually in arrears on March 15 and September 15 of each year

Contractual interest rate for funds borrowed, under the debt agreement.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

+ References

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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