Business Acquisitions - Estimated Fair Values and Useful Lives of Intangible Assets Acquired (Detail) (OnPoint Consulting, Inc. [Member], USD $) In Thousands, unless otherwise specified	0 Months Ended
	Feb. 05, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 7,780
Backlog [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets	5,290
Weighted Average Useful Life	7 years
Customer relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets	2,260
Weighted Average Useful Life	7 years
Tradename [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 230
Weighted Average Useful Life	2 years