Senior Secured Notes and Subordinated Notes (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Senior Secured Notes
Debt Instrument [Line Items]
Fair Value	$ 2,912,753	$ 6,448,352
Subordinated Notes
Debt Instrument [Line Items]
Fair Value	119,577	348,752
Non-Consolidated Affiliates Senior Secured Notes \| Senior Secured Notes
Debt Instrument [Line Items]
Borrowing Outstanding		2,500
Fair Value		2,504
Non-Consolidated Affiliates Senior Secured Notes \| Subordinated Notes
Debt Instrument [Line Items]
Borrowing Outstanding	10,000	24,200
Fair Value	$ 9,616	$ 14,377

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

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant