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Outstanding Common Stock Equivalents That Were Anti-Dilutive Tickmarks (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Earnings Per Share [Abstract] |  |  |
Anti-dilutive Non-Vested Stock Weighted Average Grant Date Fair Value | $ 38.40 | $ 52.07 | $ 61.15

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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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