Long-Term Debt (Priority Guarantee) (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Total Consolidated Secured Debt	$ 12,830,043	$ 12,575,294
Priority Guarantee Notes [Member]
Debt Instrument [Line Items]
Total Consolidated Secured Debt	6,274,815	5,324,815
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	1,000,000
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
Priority Guarantee Notes [Member] \| 10.625% Priority Guarantee Notes Due 2023 [Member]
Debt Instrument [Line Items]
Total Consolidated Secured Debt	$ 950,000	$ 0
Maturity date	Mar. 15, 2023
Stated interest rate	10.625%

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

Reference 1: 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

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+ References

Reference 1: 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

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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 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

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 SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 16
-Article 9

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