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Condensed Consolidated Financial Statements - Additional Information (Detail) - USD ($) $ in Thousands		9 Months Ended
	Jan. 01, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Summary Of Significant Accounting Policies [Line Items]
Amount of off balance sheet settlement funds		$ 254,600		$ 260,200
Increase to net cash provided by operating activities		64,856	$ 123,843
Increase to net cash used in financing activities		$ (251,298)	(110,016)
Adjustments for New Accounting Pronouncement [Member]
Summary Of Significant Accounting Policies [Line Items]
Increase to net cash provided by operating activities			4,900
Increase to net cash used in financing activities			$ 4,900
Cumulative-effect adjustment to retained earnings, net of tax	$ 700
Cumulative-effect adjustment to retained earnings, tax	$ 400

X

- Definition

The balance of the settlement funds at period end. Settlement funds are trust accounts maintained for the benefit of the Company's clients. They are not included in the Company's balance sheet.

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Summary Of Significant Accounting Policies [Line Items]

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Amount of the cumulative effect on retained earnings net of related income tax effect.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22663-107794

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Amount of the related income tax effect of a cumulative effect on retained earnings.

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-Topic 250
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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
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Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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