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Lease Commitments - Additional Information (Detail)
12 Months Ended
Dec. 31, 2017
USD ($)
Hospital
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Leases [Abstract]      
Number of hospital facilities | Hospital 3    
Additional capital lease obligations incurred | $ $ 0 $ 152,000 $ 7,000,000