Share Based Compensation - Share Based Compensation Expense Included in Operating Expense (Income) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based and Long-Term Incentive Compensation	$ 4,474	$ 3,417	$ 16,809
General and Administrative Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based and Long-Term Incentive Compensation	2,451	1,001	7,779
Other Operating Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based and Long-Term Incentive Compensation	$ 2,023	$ 2,416	$ 9,030