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Fair Value of Stock Settled Performance Units (Detail) - Performance Units Awards $ in Thousands | 9 Months Ended
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Sep. 30, 2015 USD ($)
2015 |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Aggregate fair value at date of grant | $ 4,052
2014 |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Aggregate fair value at date of grant | 5,388
2013 |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Aggregate fair value at date of grant | 5,564
2012 |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Aggregate fair value at date of grant | 3,065
2011 |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Aggregate fair value at date of grant | $ 5,569

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