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Stock - Based Compensation - Summary of Accumulated Stock Units (Detail) - $ / shares | Mar. 31, 2016 | Dec. 31, 2015
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Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |
Accumulated stock units | 67,558 | 66,376
Average price | $ 40.17 | $ 39.64

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- Definition Deferred compensation arrangement with individual accumulated stock units For deferred board fees. + References No definition available. + Details
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- Definition Deferred compensation arrangement with individual stock average price. + References No definition available. + Details
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- References No definition available. + Details
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