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Leases (Narrative) (Detail)
 12 Months Ended
Dec. 31, 2016
USD ($)
agreement
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
agreement
Operating and Capital Leases [Line Items]      
Sublease rent $ 800,000    
Equipment lease expense $ 700,000 $ 1,000,000 $ 1,200,000
Operating leases | agreement 20    
Number of leased centers closed | agreement 3    
Number of sublease agreements | agreement     17
Discontinued Operations [Member]      
Operating and Capital Leases [Line Items]      
Rent expense accrual     $ 4,400,000
Minimum [Member]      
Operating and Capital Leases [Line Items]      
Control Centers leases monthly price range $ 1,800    
Control Centers leases term 5 years    
Maximum [Member]      
Operating and Capital Leases [Line Items]      
Control Centers leases monthly price range $ 4,200    
Control Centers leases term 10 years