Joint Ventures - Condensed Balance Sheets of Consolidated JV (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Equity Method Investments [Line Items]
Cash	$ 545,419	$ 866,253	$ 1,153,507	$ 480,794
Land under development	33,689	41,328
Equity	1,124,255us-gaap_StockholdersEquity	1,261,352us-gaap_StockholdersEquity	1,480,477us-gaap_StockholdersEquity	1,374,799us-gaap_StockholdersEquity
Total liabilities and shareholders' equity	2,351,335	2,486,148
Consolidated Entities [Member]
Schedule Of Equity Method Investments [Line Items]
Cash	481	668
Restricted cash	160	248
Other assets	332	542
Land under development	2,617	5,810
Total assets	3,590	7,268
Debt	64	3,365
Accrued expenses	1,231	862
Equity	2,295	3,041
Total liabilities and shareholders' equity	$ 3,590	$ 7,268

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities.

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