Segment and Related Information - Reconciliation of Operating Income from Segments to Consolidated (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Total segment operating income	$ 34,491	$ 38,838
Amortization of other intangibles	(4,850)	(3,315)
Other income (expense), net	586	599
Income before income taxes	35,077	39,437
Operating segment and corporate non-segment
Segment Reporting Information [Line Items]
Total segment operating income	46,023	47,535
Segment reconciling items
Segment Reporting Information [Line Items]
Amortization of acquired software	(6,682)	(5,382)
Amortization of other intangibles	(4,850)	(3,315)
Other income (expense), net	$ 586	$ 599

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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