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Fair Value of Financial Instruments - Additional Information (Detail)
$ in Millions
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Jun. 30, 2011
instrument
Fair Value of Financial Instruments [Line Items]      
Interest rate 3.75% 3.65%  
Notes payable, fair value $ 832.4 $ 886.4  
Notes payable, carrying value 892.9 $ 784.8  
Interest Rate Swap      
Fair Value of Financial Instruments [Line Items]      
Fair value of derivative liability $ 2.9    
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap      
Fair Value of Financial Instruments [Line Items]      
Derivative, number of instruments held | instrument     1