Acquisitions (Detail) $ in Millions	1 Months Ended		12 Months Ended
	Apr. 30, 2015 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2014 USD ($) business
UK Elite Soccer, Inc. | Provider of Soccer Clinics
Number of businesses acquired | business			3
Total purchase price			$ 1.0
Purchase price net of cash acquired			0.5
UK Elite Soccer, Inc. | Customer relationships | Provider of Soccer Clinics
Current assets			0.2
Current liabilities			0.6
Intangible assets			$ 0.9
Black Hawk Energy Services Ltd. | Black Hawk Energy Services, Inc.
Total purchase price		$ 59.6
Selling, General and Administrative Expenses | Black Hawk Energy Services Ltd. | Black Hawk Energy Services, Inc.
Escrow	$ 0.5