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Restructuring Charges - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 9,826,000us-gaap_RestructuringCharges	$ 6,921,000us-gaap_RestructuringCharges	$ 7,565,000us-gaap_RestructuringCharges
Restructuring liability	$ 9,000,000us-gaap_RestructuringReserve	$ 4,900,000us-gaap_RestructuringReserve
Assets Held for Sale [Member]
Restructuring Cost and Reserve [Line Items]
Number of vessels	2
Shuttle tankers reflagged [Member]
Restructuring Cost and Reserve [Line Items]
Number of vessels	1

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References+ Details