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Related Party Transactions (Narrative) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Related Party Transactions [Abstract]      
Revenue earned $ 0.3 $ 0.8 $ 0.6
Landlord interest 50.00%    
Total rent expense $ 1.4 $ 1.3 $ 1.2