Restructuring and Exit-Related Charges - Schedule of Employee Post-Termination Benefits and Asset Impairments (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Employee terminations:
Employee terminations	$ 1,400,000
Asset impairments:
Identifiable intangible assets (Cosmedicine)	100,000
Total asset impairments	800,000
Total restructuring and exit-related charges	2,200,000	$ 0	$ 0
Real Industry
Employee terminations:
Employee terminations	300,000
Real Alloy
Employee terminations:
Employee terminations	1,000,000
Cosmedicine
Employee terminations:
Employee terminations	100,000
Asset impairments:
Inventories (Cosmedicine)	700,000
Identifiable intangible assets (Cosmedicine)	$ 100,000