Commitments and Contingencies (Contractual Commitments - Land Pipeline) - Additional Information (Detail) $ in Millions		3 Months Ended
	Sep. 30, 2015 USD ($) ft² a Buyer	Sep. 30, 2015 ft² a Buyer Transaction
Loss Contingencies [Line Items]
Area of real estate property | ft²	1,270,000	1,270,000
Construction and Other Commitment [Member]
Loss Contingencies [Line Items]
Number of buyers | Buyer	8	8
Area of real estate property | a	1,900	1,900
Percentage area of real estate property	18.00%
Anticipated sale proceeds	$ 79.3
Number of land transactions closed | Transaction		0