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Investment in Unconsolidated Companies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Mar. 31, 2014
DTDW Holdings, Ltd.
Schedule of Equity Method Investments [Line Items]
Ownership percentage in unconsolidated affiliates	40.00%	40.00%
Advances to unconsolidated companies	$ 1.9
Amount of vessel sold	23.3
Gain realized from vessel sold	7.9
Deferred gain recognized from vessel sold	$ 5.2
Maximum
Schedule of Equity Method Investments [Line Items]
Ownership percentage in unconsolidated affiliates		50.00%

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Long-Term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. This does not include advances to clients.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of transactions with related party during the financial reporting period.

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