Notes Receivable - Additional Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2013 SecurityLoan	Dec. 31, 2012 SecurityLoan	Dec. 31, 2011
Receivables [Abstract]
Number of loans receivable outstanding	7	6
Maturity date of the principal amount	September 2011
Principal amount of loans subject to delinquent principal or interest	$ 9,800,000
Number of loans outstanding	1
Loan loss reserve	$ 0	$ 4,300,000	$ 5,000,000
Past due on interest payments	90 days
Number of mortgage loans on real estate fully reserved	1

Amount of reserve for write-down of a mortgage loan on real estate.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule IV)

-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 29

-Article 12

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule IV

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 948

-SubTopic 310

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-29.7)

-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

Name:	us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant