Related Party Transactions - Additional Information (Detail) (Elm Street [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014 Lot	Dec. 31, 2013	Dec. 31, 2012
Elm Street [Member]
Related Party Transaction [Line Items]
Related party forward lot purchase agreement purchase price	$ 40,800
Number of related parties for forward lot purchase agreement	1
Market price of developed lots	50,100	38,400	54,600
Expected number of lots from joint venture with Elm Street	2,400
Development costs to manage property under related party transactions	$ 143	$ 143	$ 143

Expected yield of finished lots with remaining land of related party.

No definition available.

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Management fee paid to related party for property development.

No definition available.

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Number of related parties for forward lot purchase agreement.

No definition available.

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Fixed price purchase agreements entered into with related party.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration