Loans, Notes and Certificates and Loan Servicing Rights - Fair value on a recurring basis (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	$ 4,556,081	$ 2,798,505
Fair value	$ 4,571,583	$ 2,813,618
Interest rates (fixed) minimum	4.99%	5.79%
Interest rates (fixed) maximum	29.90%	29.90%
Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Original term	12 months	12 months
Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Original term	60 months	60 months
Fair Value, Measurements, Recurring \| Notes and Certificates
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Aggregate principal balance outstanding	$ 4,697,169	$ 2,851,837
Net fair value adjustments	(125,586)	(38,219)
Fair value	4,571,583	2,813,618
Fair Value, Measurements, Recurring \| Loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Aggregate principal balance outstanding	4,681,671	2,836,729
Net fair value adjustments	(125,590)	(38,224)
Fair value	$ 4,556,081	$ 2,798,505

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- Definition

Notes and Certificates at fair value

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- Definition

Principal amount of loan before fair value adjustment.

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- Definition

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Amount of addition (reduction) to the amount at which an asset could be incurred (settled) in a current transaction between willing parties.

+ References

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- Definition

When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

+ 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)(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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When presenting a range of interest rates, the lowest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Amount of addition (reduction) to the amount at which a liability could be incurred (settled) in a current transaction between willing parties.

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- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Glossary Loan
-URI http://asc.fasb.org/extlink&oid=6517073

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