Exit Activities (Detail) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016
Predecessor [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated		28	53
Severance and Termination Benefits	$ 700	$ 1,100
Liabilities Subject to Compromise, Early Contract Termination Fees		1,300
Payments for Restructuring		1,100
Restructuring Reserve, Accretion of Obligation		$ 317
Successor [Member]
Restructuring Cost and Reserve [Line Items]
Severance and Termination Adjustment	100
Restructuring Reserve, Accretion of Obligation	$ 0