Lease Intangibles, Net - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Capital Leased Assets [Line Items]    
Amortization amount to rental revenue for capitalized leases $ 3.0 $ 0.7
Amortization amount to rental revenue for capitalized leases due to merger 1.5  
In-place Leases
   
Capital Leased Assets [Line Items]    
Leases amortization expenses 26.9 8.8
Lease amortization expense due to merger $ 16.7