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Segment Information - Reconciliation of Segment Operating Income to Consolidated Income Before Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Unallocated corporate expenses |  | $ (207,446) | $ (209,929) | $ (214,220)
Stock-based compensation expense |  | (18,040) | (12,074) | (17,289)
Operating Income (Loss) |  | (12,449) | 13,083 | (5,011)
Gain (Loss) on Extinguishment of Debt |  | (1,362) | (5,695) | 0
Non-operating expense, net |  | (12,406) | (13,984) | (11,937)
Loss before income taxes |  | (26,217) | (6,596) | (16,948)
Operating Segments [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Operating Income (Loss) |  | 12,977 | 38,008 | 24,414
Corporate, Non-Segment [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Unallocated corporate expenses | [1] | (3,416) | (4,532) | (3,769)
Stock-based compensation expense |  | (18,040) | (12,074) | (17,289)
Amortization |  | $ (3,970) | $ (8,319) | $ (8,367)
[1] | Together with amortization of intangibles and stock-based compensation, the Company does not allocate restructuring and related charges and certain other non-recurring charges to the operating income for each segment because management does not include this information in the measurement of the performance of the operating segments.

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