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Fair Value of Stock Settled Performance Units (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Sep. 30, 2014
Performance Unit Awards 2014 |
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Performance Options [Line Items] |
Fair value at date of grant | $ 5,388
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

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- Definition Share based compensation arrangement by share based payment award grant date fair value of awards. + References No definition available. + Details
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