Income Taxes - Deferred Tax Balance Classification in Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Disclosure Income Taxes Deferred Tax Balance Classification In Balance Sheet [Abstract]
Current deferred tax assets	$ 9,585	$ 101,451
Current deferred tax liabilities	(672)
Net current deferred taxes	8,913	101,451
Long term deferred tax assets	1,639	60,421
Long term deferred tax liabilities	(715,067)	(860,360)
Net long term deferred taxes	(713,428)	(799,939)
Net deferred tax liabilities	$ (704,515)	$ (698,488)