Income Taxes - Deferred Tax Asset (Liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Net operating loss	$ 611,631	$ 522,541
State deferred tax assets	159	9,160
Capital loss carryforwards	0	12,193
Property and equipment	23,203	27,372
Investment in Laramie Energy	0	42,986
Contingent consideration	0	9,653
Other	10,709	9,234
Total deferred tax assets	645,702	633,139
Valuation allowance	(613,866)	(621,220)
Net deferred tax assets	31,836	11,919
Deferred tax liabilities:
Investment in Laramie Energy	20,600	0
Convertible notes	6,866	0
Intangible assets	2,671	9,834
Other	2,331	2,023
State liabilities	6	62
Total deferred tax liabilities	32,474	11,919
Total deferred tax liabilities	$ (638)	$ 0