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Debt and Financing Arrangements - Summary of Recognized Interest Expense (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total interest expense | $ 1,434 | $ 1,614 | $ 1,817 | $ 1,780 | $ 1,689 | $ 1,777 | $ 1,692 | $ 1,517 | $ 6,645 | $ 6,675 | $ 6,593
2006 Convertible Senior Subordinated Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total interest expense |  |  |  |  |  |  |  |  |  |  | 8
Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total interest expense |  |  |  |  |  |  |  |  | $ 6,645 | $ 6,675 | $ 6,585

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