Segment and Related Information - Reconciliation of Operating Income from Segments to Consolidated (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Operating Income	$ 37,142	$ 37,298	$ 75,980	$ 74,129
Amortization of customer and trade name intangibles	(4,041)	(3,331)	(7,356)	(6,656)
Other income (expense), net	558	(101)	1,157	(291)
Income before income taxes	37,700	37,197	77,137	73,838
Operating segment and corporate non-segment
Segment Reporting Information [Line Items]
Operating Income	46,907	45,989	94,442	91,555
Segment reconciling items
Segment Reporting Information [Line Items]
Amortization of acquired software	(5,724)	(5,360)	(11,106)	(10,770)
Amortization of customer and trade name intangibles	(4,041)	(3,331)	(7,356)	(6,656)
Other income (expense), net	$ 558	$ (101)	$ 1,157	$ (291)

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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