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Segment and Related Information - Reconciliation of Operating Income from Segments to Consolidated (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Operating Income (Loss)	$ 37,075	$ 30,915	$ 73,224	$ 58,956
Amortization of acquired software	(5,360)	(5,680)	(10,770)	(11,139)
Amortization of customer and trade name intangibles	(3,463)	(3,453)	(6,921)	(6,815)
Other expense, net	(101)	(720)	(291)	(1,187)
Income before income taxes	36,974	30,195	72,933	57,769
Operating segments
Segment Reporting Information [Line Items]
Operating Income (Loss)	45,898	40,048	90,915	76,910
Segment reconciling items
Segment Reporting Information [Line Items]
Amortization of acquired software	(5,360)	(5,680)	(10,770)	(11,139)
Amortization of customer and trade name intangibles	(3,463)	(3,453)	(6,921)	(6,815)
Other expense, net	$ (101)	$ (720)	$ (291)	$ (1,187)

X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

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- Definition

The amount of expense recognized in the current period that reflects the allocation of the costs of intangible assets over the expected benefit period of such assets. This element applies only to intangible assets used in the production of goods.

+ References

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-Publisher FASB
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-SubTopic 10
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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

+ References

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-Publisher FASB
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The net result for the period of deducting operating expenses from operating revenues.

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Amount of income (expense) related to nonoperating activities, classified as other.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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