Joint Ventures - Condensed Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets:
Cash	$ 396,619	$ 425,316	$ 545,419	$ 866,253
Land under development	46,999	60,611
Liabilities and equity:
Equity	1,304,441	1,239,165	$ 1,124,255	$ 1,261,352
Total liabilities and shareholders' equity	2,643,943	2,511,718
Consolidated Joint Venture
Assets:
Cash	1,214	990
Other assets	37	379
Land under development		380
Total assets	1,251	1,749
Liabilities and equity:
Accrued expenses	550	567
Equity	701	1,182
Total liabilities and shareholders' equity	$ 1,251	$ 1,749