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Business Overview (Details)
Oct. 01, 2015
shares
Jun. 30, 2017
state
client
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Area of operations, number of states | state   36
Number of residential clients   11,800
Number of periodic clients (more than)   18,600
2016 Unit Plan | Secondary Offering | NMH Investment | Common Stock    
Product Information [Line Items]    
Shares sold by stockholders (in shares) | shares 25,250,000