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Other Assets - Summary of Amortization Expense Related to the Intangibles, Excluding Above and Below-Market Leases (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Intangible Assets Net Excluding Goodwill [Abstract]      
Amortization expense $ 92.6 $ 109.5 $ 57.0