Income Taxes - Significant Portions of Deferred Tax Assets and Liabilities Due to Temporary Differences (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Classified as follows:
Other current assets (Note 9)	$ 12,009	$ 13,703
Deferred charges and other assets (Note 13)	1,899	1,681
Current deferred income tax liabilities	(1,120)	(144)
Other long-term liabilities	(3,677)	(4,786)
Net deferred tax assets	$ 9,111	$ 10,454