Minimum Future Rental Payments under Ground Leases (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Schedule of Operating Leases [Line Items]
Operating leases, future minimum payments payment year 2013	$ 1,941
Operating leases, future minimum payments payment year 2014	1,948
Operating leases, future minimum payments payment year 2015	1,955
Operating leases, future minimum payments payment year 2016	1,955
Operating leases, future minimum payments payment thereafter	11,573
Operating leases, future minimum payments payment	21,307
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 1,935