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Financial Instruments and Fair Value Measurements - Carrying Value and Estimated Fair Values (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Financial assets    
Interest rate swap $ 2,546 $ 214
Carrying Amount    
Financial assets    
Interest rate swap 2,546 214
Carrying Amount | Credit Facility | Senior Secured Term B Loan    
Financial liabilities    
Senior secured term loan 375,165 376,395
Carrying Amount | Credit Facility | 2018 Term A Loan    
Financial liabilities    
Senior secured term loan 0 26,690
Carrying Amount | Credit Facility | 2020 Term A Loan    
Financial liabilities    
Senior secured term loan 189,974 200,653
Fair Value    
Financial assets    
Interest rate swap 2,546 214
Fair Value | Credit Facility | Senior Secured Term B Loan    
Financial liabilities    
Senior secured term loan 378,526 370,540
Fair Value | Credit Facility | 2018 Term A Loan    
Financial liabilities    
Senior secured term loan 0 26,027
Fair Value | Credit Facility | 2020 Term A Loan    
Financial liabilities    
Senior secured term loan $ 190,640 $ 196,584