Debt and Financing Arrangements - Classification of the Company Lease Obligations (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Operating Lease Obligations:
Other Current Liabilities (current portion)	$ 1,100
Other Noncurrent Liabilities (long-term portion)	2,800
Total Operating Lease Obligations	3,855
Capital Lease Obligations:
Other Current Liabilities (current portion)	3,000	$ 3,100	$ 3,100
Other Noncurrent Liabilities (long-term portion)	1,900	2,700	4,900
Total Capital Lease Obligations	4,967	5,800	8,000
Total Lease Obligations	$ 8,800	$ 5,800	$ 8,000