Mortgages Payable and Debt Maturities - Summary of Debt Obligation and Interest Rate Derivatives (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Proforma Debt Instrument [Line Items]
Line of credit	$ 115,000	$ 49,000
Term notes	575,000	575,000
Mortgage note, total	2,223	2,254
Interest rate derivatives - asset	(580)	(794)
Interest rate derivatives - liability	9,233	7,523
Line of credit - variable rate LIBOR + 1.50% (1.65% at March 31, 2014) [Member]
Proforma Debt Instrument [Line Items]
Payable due 2018	115,000
Line of credit	115,000
Debt instrument, fair value	115,000
Term Note-Fixed Rate 6.38% [Member]
Proforma Debt Instrument [Line Items]
Payables due 2016	150,000
Term notes	150,000
Term note, fair value	168,131
Term note - variable rate LIBOR+1.65% (1.80% at March 31, 2014) [Member]
Proforma Debt Instrument [Line Items]
Payables due Thereafter	225,000
Term notes	225,000
Term note, fair value	225,000
Term note - variable rate LIBOR+1.65% (1.81% at March 31, 2014) [Member]
Proforma Debt Instrument [Line Items]
Payables due Thereafter	100,000
Term notes	100,000
Term note, fair value	100,000
Term Note-Fixed Rate 5.54% [Member]
Proforma Debt Instrument [Line Items]
Payables due Thereafter	100,000
Term notes	100,000
Term note, fair value	110,576
Mortgage Note-Fixed Rate 5.99% [Member]
Proforma Debt Instrument [Line Items]
Payable due 2014	95
Payable due 2015	134
Payables due 2016	142
Payables due 2017	151
Payable due 2018	160
Payables due Thereafter	1,541
Mortgage note, total	2,223
Debt instrument, fair value	$ 2,316