Fair Value Measurements (Carrying Amounts and Estimated Fair Values of Financial Instruments Not Measured at Fair Value) (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Carrying Amount
Assets:
Cash and cash equivalents	$ 894,430	$ 1,190,080
Deposits with banks	16,388	21,445
Notes receivable, net	6,026	6,130
Liabilities:
Deposits	2,621,209	2,332,714
Notes and contracts payable	584,952	587,337
Estimated Fair Value
Assets:
Cash and cash equivalents	894,430	1,190,080
Deposits with banks	16,444	21,540
Notes receivable, net	4,440	3,930
Liabilities:
Deposits	2,621,209	2,332,714
Notes and contracts payable	596,894	595,087
Estimated Fair Value \| Level 1
Assets:
Cash and cash equivalents	894,430	1,190,080
Deposits with banks	547	4,068
Liabilities:
Deposits	2,621,209	2,332,714
Estimated Fair Value \| Level 2
Assets:
Deposits with banks	15,897	17,472
Liabilities:
Notes and contracts payable	590,673	588,542
Estimated Fair Value \| Level 3
Assets:
Notes receivable, net	4,440	3,930
Liabilities:
Notes and contracts payable	$ 6,221	$ 6,545

Deposits with banks fair value disclosure.

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13476-108611

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- Definition

Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

+ References

No definition available.

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- References

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- References

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- Definition

Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future 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 210.5-02.3(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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