Income Taxes - Components of Deferred Taxes (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred Tax Assets:
Accrued third party obligations, deductible for taxes upon economic performance	$ 16,973	$ 10,144
Provision for doubtful accounts receivable	756	1,111
Excess of financial statement over tax depreciation	9,852	8,122
Deductible stock compensation expense, net	11,621	9,382
Foreign currency translation adjustment	3,432	0
Partnership basis difference	0	1,426
Retained liability for cargo claims	802	983
Total gross deferred tax assets	43,436	31,168
Deferred Tax Liabilities:
Unremitted foreign earnings, net of related foreign tax credits	(83,186)	(94,787)
Foreign currency translation adjustment	0	(3,141)
Other	(135)	(135)
Total gross deferred tax liabilities	(83,321)	(98,063)
Net deferred tax liabilities	(39,885)	(66,895)
Current deferred tax assets	(18,396)	(12,102)
Noncurrent deferred tax liabilities	$ (58,281)	$ (78,997)