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Derivative instruments - Schedule of Fair Values of Derivative Instruments (Detail) (Cross-currency swap [Member], Other long-term assets [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Cross-currency swap [Member] \| Other long-term assets [Member]
Derivatives, Fair Value [Line Items]
Fair value: favorable (unfavorable)	$ 305	$ 1,011

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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