Other Assets - Additional Information (Detail) (Leases, Acquired-in-Place [Member], USD $)
In Millions, unless otherwise specified |
Dec. 31, 2013
|
Dec. 31, 2012
|
---|---|---|
Leases, Acquired-in-Place [Member]
|
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Other Assets [Line Items] | ||
Gross in-place lease intangibles | $ 48.3 | $ 33.3 |
Accumulated amortization | $ 36.2 | $ 19.1 |