Income Taxes - Components of Deferred Taxes (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets:
Deductible stock compensation expense, net	$ 18,569	$ 19,011
Operating lease liabilities	52,966
Accrued third party obligations, deductible for taxes upon economic performance	5,333	7,726
Excess of financial statement over tax depreciation	5,802	5,134
Foreign currency translation adjustments	9,248	37,299
Retained liability for cargo claims	1,006	1,025
Provision for doubtful accounts receivable	916	1,443
Total gross deferred tax assets	93,840	71,638
Deferred Tax Liabilities:
Unremitted foreign earnings, net of related foreign tax credits	31,615	31,173
Operating lease assets	52,351
Deferred contract costs	1,840
Total gross deferred tax liabilities	85,806	31,173
Net deferred tax assets	$ 8,034	$ 40,465