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Acquisitions (First Quarter 2015) - Additional Information (Detail) - Model Consulting, Inc [Member] - USD ($) $ in Millions		12 Months Ended
	Mar. 01, 2015	Dec. 31, 2015
Business Acquisition, Contingent Consideration [Line Items]
Annual revenue	$ 4.2
Acquired entity, name	Model Consulting, Inc
Effective date of acquisition		Mar. 01, 2015

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Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e845-128460

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6919109

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Name of the acquired entity.

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-Topic 805
-SubTopic 10
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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
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-Paragraph 2
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