Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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

Mortgage Repurchase Facility - Additional information (Detail) (USD $)	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2012 Maximum [Member]	Sep. 30, 2012 Financial Services [Member]	Dec. 31, 2011 Financial Services [Member]	Sep. 30, 2012 Minimum [Member]
Lines Of Credit And Debt Obligations [Line Items]
Maximum aggregate commitment		$ 50,000,000
Mortgage repurchase facility			$ 46,888,000	$ 48,702,000
LIBOR basis spread		3.25%			2.50%
Mortgage repurchase facility pricing rate	Mortgage Repurchase Facility carry a Pricing Rate equal to the greater of (i) the LIBOR Rate (as defined in the Mortgage Repurchase Facility) plus 2.5%, or (ii) 3.25%.