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Summary of Restructuring Related Obligations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Restructuring Reserve [Roll Forward]
Balance at beginning of period	$ 17,263	$ 576
Employee, office and other costs accrued, net	0	(3)
Accretion of firm transportation obligation	207	0
Cash payments, net	(498)	(98)
Balance at end of period	$ 16,972	$ 475

Amount of any reversal and other adjustment made during the period to the amount of a previously accrued liability for a specified type of restructuring cost, excluding adjustments for costs incurred during the period, costs settled during the period, and foreign currency translation adjustments.

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- Definition

Amount of cash paid in the period to fully or partially settle a specified, previously accrued type of restructuring cost.

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