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Revenue Recognition and Accounts Receivable - Summary Information for Accounts Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Receivables [Abstract]            
Accounts receivable (net of contractual allowances) $ 18,394us-gaap_AccountsReceivableGrossCurrent   $ 16,753us-gaap_AccountsReceivableGrossCurrent      
Less allowance for doubtful accounts (7,279)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (7,330)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (6,903)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (7,239)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (7,799)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (7,761)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Patient accounts receivable-net $ 11,115us-gaap_ReceivablesNetCurrent   $ 9,850us-gaap_ReceivablesNetCurrent