Significant Components of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets:
Employee benefits	$ 1,757	$ 1,032
Inventories	5,923	7,161
Goodwill	1,358	1,842
Other	4,438	3,761
Total deferred tax assets	13,476	13,796
Deferred tax liabilities:
Depreciation	54,973	45,056
Foreign earnings	1,816	2,665
Total deferred tax liabilities	56,789	47,721
Net deferred tax liabilities	$ 43,313	$ 33,925