Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Fair Value of Financial Assets and Liabilities (Detail)

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Fair Value Measurements - Summary of Fair Value of Financial Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Assets    
Estimated fair value of assets held for sale $ 1,375 $ 3,500
Liabilities:    
Estimated fair value of contingent earn-out consideration included in accrued expenses 51  
Long-term debt and capital lease obligations less unamortized debt issuance costs 250,410  
Other Indefinite Lived Intangible Assets [Member]    
Assets    
Estimated fair value of other indefinite-lived intangible assets 313  
Estimated fair value of assets held for sale 1,375  
Fair Value, Inputs, Level 2 [Member] | Other Indefinite Lived Intangible Assets [Member]    
Liabilities:    
Long-term debt and capital lease obligations less unamortized debt issuance costs 221,113  
Fair Value, Inputs, Level 3 [Member] | Other Indefinite Lived Intangible Assets [Member]    
Assets    
Estimated fair value of assets held for sale 1,375  
Estimated fair value of other indefinite-lived intangible assets 313  
Liabilities:    
Estimated fair value of contingent earn-out consideration included in accrued expenses $ 51