Commitments and Contingencies - Minimum Aggregate Lease Payments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Leases [Abstract]
Gross Rents, 2015	$ 24,133
Gross Rents, 2016	24,676
Gross Rents, 2017	23,946
Gross Rents, 2018	24,022
Gross Rents, 2019	23,479
Gross Rents, Thereafter	303,764
Gross Rents, Total lease commitments	424,020
Sublease Rents, 2015	2,806
Sublease Rents, 2016	2,720
Sublease Rents, 2017	2,590
Sublease Rents, 2018	2,225
Sublease Rents, 2019	2,089
Sublease Rents, Thereafter	10,554
Sublease Rents, Total lease commitments	22,984
Net Rents, 2015	21,327
Net Rents, 2016	21,956
Net Rents, 2017	21,356
Net Rents, 2018	21,797
Net Rents, 2019	21,390
Net Rents, Thereafter	293,210
Net Rents, Total lease commitments	$ 401,036