Segment and Related Information - Reconciliation of Operating Income from Segments to Consolidated (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total segment operating income	$ 152,492	$ 162,758	$ 137,656
Amortization of customer and trade name intangibles	(39,600)	(35,500)	(35,900)
Other income (expense), net	3,378	698	(1,998)
Income before income taxes	155,870	163,456	135,658
Operating Segments And Corporate Non Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total segment operating income	191,681	197,825	173,093
Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Amortization of acquired software	(22,972)	(21,686)	(22,235)
Amortization of customer and trade name intangibles	(16,217)	(13,381)	(13,202)
Other income (expense), net	$ 3,378	$ 698	$ (1,998)

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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