Segment Information - Reconciliation of Segment Operating Income to Consolidated Income Before Income Taxes (Detail) - USD ($) $ in Thousands		12 Months Ended
		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.