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Financial Instruments - Carrying And Estimated Fair Value Of Other Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Acquisition-related contingent consideration, including current portion $ 2,960 $ 3,750
Long-term debt 316,250 400,000
Total 319,210 403,750
Level 1 | Estimate of Fair Value Measurement    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Acquisition-related contingent consideration, including current portion 0 0
Long-term debt 0 0
Total 0 0
Level 2 | Estimate of Fair Value Measurement    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Acquisition-related contingent consideration, including current portion 0 0
Long-term debt 291,837 409,000
Total 291,837 409,000
Level 3 | Estimate of Fair Value Measurement    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Acquisition-related contingent consideration, including current portion 2,960 3,750
Long-term debt 0 0
Total $ 2,960 $ 3,750