Senior Secured Notes and Subordinated Notes (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Senior Secured Notes
Debt Instrument [Line Items]
Fair Value	$ 3,467,956	$ 3,225,064
Subordinated Notes
Debt Instrument [Line Items]
Fair Value	86,063	98,371
Non-Consolidated Affiliates Senior Secured Notes \| Subordinated Notes
Debt Instrument [Line Items]
Borrowing Outstanding	10,000	10,000
Fair Value	$ 8,164	$ 8,231

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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)
-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 20
-Article 5

Reference 3: 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant