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Fair Value of Stock Settled Performance Units (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jun. 30, 2013
Performance Unit Awards 2013 |
Schedule of Share based Compensation Arrangements by Share based Payment Award, Performance Options [Line Items] |
Fair value at date of grant | $ 5,564
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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