Discontinued Operations (Summary of Selected Operating Results for Properties Sold or Held for Sale) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Discontinued Operations and Disposal Groups [Abstract]
Total revenue										$ 2,175	$ 5,502
Operating income										1,066	2,438
Income (loss) from discontinued operations	$ 56	[1]	$ 899	[1]	$ 1,689	[1]	$ 447	[1]	$ 0	$ 3,091	$ (79)

[1] Amounts are reclassified to reflect the reporting of discontinued operations.