Income Taxes - Components of Deferred Taxes (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred Tax Assets:
Accrued third party obligations, deductible for taxes upon economic performance	$ 15,153	$ 14,473
Provision for doubtful accounts receivable	497	1,041
Excess of financial statement over tax depreciation	10,650	10,349
Deductible stock compensation expense, net	21,758	18,910
Foreign currency translation adjustment	57,207	44,519
Retained liability for cargo claims	1,178	1,350
Total gross deferred tax assets	106,443	90,642
Deferred Tax Liabilities:
Unremitted foreign earnings, net of related foreign tax credits	120,170	100,170
Total gross deferred tax liabilities	120,170	100,170
Net deferred tax liabilities	$ 13,727	$ 9,528