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Fair Value of Stock Settled Performance Units (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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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