Loans, Notes and Certificates and Loan Servicing Rights - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Debt instrument, interest rate, effective percentage rate range, minimum	4.99%	5.79%
Debt instrument, interest rate, effective percentage rate range, maximum	29.90%	29.90%
Minimum
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Original term	12 months	12 months
Maximum
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Original term	60 months	60 months
Loans
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Principal balance of underlying loan servicing rights	$ 4,290	$ 1,870
Debt instrument, interest rate, effective percentage rate range, minimum	2.99%	5.90%
Debt instrument, interest rate, effective percentage rate range, maximum	33.15%	33.15%
Debt instrument, maturity date, description	December 2022
Loans \| Minimum
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Original term	3 months	12 months
Loans \| Maximum
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Original term	84 months	60 months

Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]

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- Definition

Long Term Notes Maturity Term

+ References

No definition available.

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- Definition

Principal balances of underlying loans for the loan servicing rights.

+ References

No definition available.

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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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- Definition

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

+ References

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- Definition

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

+ 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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