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Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended
May 31, 2012
Sep. 30, 2017
Commitment And Contingencies [Line Items]    
Discontinued operations for compensatory damages and exemplary damages   $ 1.8
HHS-OIG [Member]    
Commitment And Contingencies [Line Items]    
Term of corporate integrity agreement 5 years