Exit Activities - Exit Activities (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 12, 2016 USD ($)
Restructuring and Related Activities [Abstract]
Restructuring and Related Cost, Number of Positions Eliminated	53
Severance and Termination Benefits Paid	$ 2.1
Severance and Termination Benefits	1.4
Retention Bonuses	$ 0.7
Liabilities Subject to Compromise, Early Contract Termination Fees		$ 1.7
Restructuring Reserve		$ 10.8