Organization and Significant Accounting Policies - Supplemental Cash Flow Information (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Accounting Policies [Abstract]
Interest paid, including interest capitalized	$ 23,866	$ 25,009
Income tax payments, net	1,039	1,074
Non-cash investing and financing activities:
Dividends and distributions payable	21,805	18,066
Common stock 401k matching contribution	658	670
Construction and property capital expenditure cost accruals, increase (decrease)	(2,350)	3,521
Adjustments to equity related to redeemable common units, net increase (decrease)	$ (1,064)	$ 128