Joint Ventures - Condensed Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets:
Cash	$ 425,316	$ 545,419	$ 866,253	$ 1,153,507
Land under development	60,611	33,689
Liabilities and equity:
Equity	1,239,165	1,124,255	$ 1,261,352	$ 1,480,477
Total liabilities and shareholders' equity	2,515,131	2,351,335
Consolidated Joint Venture
Assets:
Cash	990	481
Restricted cash		160
Other assets	379	332
Land under development	380	2,617
Total assets	1,749	3,590
Liabilities and equity:
Debt		64
Accrued expenses	567	1,231
Equity	1,182	2,295
Total liabilities and shareholders' equity	$ 1,749	$ 3,590