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Fair Value of Stock Settled Performance Units (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Performance Unit Awards 2012
Schedule of Share based Compensation Arrangements by Share based Payment Award, Performance Options [Line Items]
Fair value at date of grant	$ 3,065
Performance Unit Awards 2011
Schedule of Share based Compensation Arrangements by Share based Payment Award, Performance Options [Line Items]
Fair value at date of grant	5,569
Performance Unit Awards 2010
Schedule of Share based Compensation Arrangements by Share based Payment Award, Performance Options [Line Items]
Fair value at date of grant	$ 3,117

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