Income Taxes - Schedule of Tax Effects of Temporary Differences that Give Rise to Significant Portions of Deferred Tax Assets and Deferred Tax Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Deferred compensation	$ 1,023	$ 656
Foreign tax credits	16,982	12,611
Vacation and bonus accrual	2,031	5,931
Inventory valuation	6,093	5,655
Rental accrual	1,799	1,634
Hurricane relief credit	1,255	1,255
Stock-based compensation	2,977	1,307
Other	2,714	2,674
Net operating losses	56,305	55,990
Total deferred tax assets	91,179	87,713
Valuation allowance - state NOL carryforwards	(219)	(541)
Valuation allowance - tax credit carryforwards	(2,047)	(1,933)
Valuation allowance - other	(1,466)	(1,515)
Total deferred tax assets, net	87,447	83,724
Deferred tax liabilities:
Tax depreciation in excess of book depreciation	(218,064)	(198,358)
Total deferred tax liabilities	(218,064)	(198,358)
Net deferred tax liabilities	(130,617)	(114,634)
Current deferred tax assets	9,915	12,723
Deferred tax liability - long-term	(140,532)	(127,357)
Net deferred tax liabilities	$ (130,617)	$ (114,634)