Nature of Operations and Summary of Significant Accounting Policies - Interest Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest costs charged to expense	$ 534	$ 816	$ 1,118
Plus: Interest cost capitalized	297	107	108
Total	$ 831	$ 923	$ 1,226