Loans, Notes and Certificates, and Loan Servicing Rights (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 4,716,156	$ 4,556,081
Fair Value	$ 4,713,449	$ 4,571,583
Interest rate, minimum	4.99%	4.99%
Interest rate, maximum	31.89%	29.90%
Maturity dates	2021-03	2020-12
Fair Value, Measurements, Recurring \| Loans at Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Aggregate principal balance outstanding	$ 4,932,346	$ 4,681,671
Fair value adjustments	(216,190)	(125,590)
Fair Value	4,716,156	4,556,081
Fair Value, Measurements, Recurring \| Notes And Certificates At Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Aggregate principal balance outstanding	4,929,468	4,697,169
Fair value adjustments	(216,019)	(125,586)
Fair Value	$ 4,713,449	$ 4,571,583
Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes and certificates term	12 months	12 months
Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes and certificates term	60 months	60 months

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Principal amount of loan before fair value adjustment.

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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

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-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

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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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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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