Differences in Effective Tax Rate and Federal Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Tax expense (benefit) at statutory rate	35.00%	35.00%	35.00%
Foreign and state taxes	10.40%	(2.30%)	4.60%
Non-deductible expenses and other	(4.80%)	0.60%	0.10%
Valuation allowance			(24.40%)
Prior period adjustment			(3.60%)
Acquisition of MSDSonline			(6.30%)
Effective Income Tax Rate, Continuing Operations, Total	40.60%	33.30%	5.40%