Inventories (Detail) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Inventory [Line Items]
Raw material		$ 1,164	$ 819
Work-in-process		8,702	8,142
Finished goods	[1]	12,359	33,784
Supplies		1,601	1,431
Total inventories		23,826	44,176
Inventory fair value adjustments		$ 12,000
Predecessor
Inventory [Line Items]
Inventory fair value adjustments			$ 30,500

[1] The amount shown above includes the unamortized fair value adjustment of $12.0 million and $30.5 million at March 31, 2016 and December 31, 2015, respectively.