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Commitments and Contingencies - Additional Information (Details)
1 Months Ended
Jul. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
letter_of_credit
Debt Instrument [Line Items]    
Number of letters of credit | letter_of_credit   2
Standby Letters of Credit    
Debt Instrument [Line Items]    
Current borrowing capacity   $ 17,800,000
First lien credit facility | Credit Facility    
Debt Instrument [Line Items]    
Line of credit facility   75,000,000.0
Unused portion of facility   59,500,000
First lien credit facility | Letter of Credit    
Debt Instrument [Line Items]    
Line of credit facility   40,000,000.0
First lien credit facility | Swingline    
Debt Instrument [Line Items]    
Line of credit facility   10,000,000.0
Workers' Compensation Obligation | Line of Credit    
Debt Instrument [Line Items]    
Line of credit facility   5,000,000.0
Unused portion of facility   $ 2,700,000
Subsequent Event    
Debt Instrument [Line Items]    
Operating leases, future minimum payments due $ 32,400,000  
Operating lease term 10 years