Fair Value Measurements (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash, restricted cash, and short-term investments	$ 10,295	$ 24,947
Line of credit facility, fair value of amount outstanding	58,000	100,000
Supply chain financing, amount outstanding	0	20,833
Long-term debt	875,000	675,000
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash, restricted cash, and short-term investments	10,295	24,947
Line of credit facility, fair value of amount outstanding	58,000	99,909
Supply chain financing, amount outstanding	0	20,833
Long-term debt	$ 863,340	$ 612,546