Future Commitments to Pay for Usage of Certain Port Facilities, Marine Consumables, Services and Maintenance Contracts (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Commitments and Contingencies Disclosure [Line Items]
2012	$ 195,680
2013	159,602
2014	93,013
2015	86,145
2016	54,595
Thereafter	157,737
Future Non Cancelable Purchase Commitments, Total	$ 746,772

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Future Non Cancelable Purchase Commitments

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Future Non Cancelable Purchase Commitments Due In Fifth Year

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Future Non Cancelable Purchase Commitments Due In Fourth Year

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Future Non Cancelable Purchase Commitments Due In Second Year

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Future Non Cancelable Purchase Commitments Due In Third Year

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Future Non Cancelable Purchase Commitments Due Thereafter

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Future Non Cancelable Purchase Commitments Due Within One Year

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