Property, Plant and Equipment, Net - Property, Plant and Equipment, Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 790,425	$ 651,240
Less: accumulated depreciation	581,013	407,668
Property plant and equipment, net	209,412	243,572
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 247,255	255,908
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives	3 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful lives	15 years
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 9,982	9,838
Useful lives	40 years
Data Processing Equipment [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 129,988	92,257
Data Processing Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives	3 years
Data Processing Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful lives	5 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 176,389	117,894
Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives	1 year
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful lives	10 years
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 218,452	168,296
Furniture and Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives	5 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful lives	10 years
Land [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 8,359	$ 7,047