Fair Value - Undesignated Derivative Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013
Other Assets [Member] \| Forward Sales Contracts [Member]
Derivative Assets:
Fair value of derivatives	$ 12,810
NVRM - Accounts Payable and Other Liabilities [Member] \| Rate Lock Commitments [Member]
Derivative Liabilities:
Fair value of derivatives	$ 3,600

Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959

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