Segment and Related Information - Reconciliation of Operating Income from Segments to Consolidated (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information
Total segment operating income	$ 33,893	$ 34,491
Other income, net	990	586
Income before income taxes	34,883	35,077
Operating segment and corporate non-segment
Segment Reporting Information
Total segment operating income	47,312	46,023
Segment reconciling items
Segment Reporting Information
Other income, net	990	586
Segment reconciling items \| Acquired software
Segment Reporting Information
Amortization of intangibles assets	(8,027)	(6,682)
Segment reconciling items \| Customer and trade name
Segment Reporting Information
Amortization of intangibles assets	$ (5,392)	$ (4,850)

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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