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Performance Units (Detail)	12 Months Ended
	Dec. 31, 2017 shares
2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Target number of shares	186,198
2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Target number of shares	185,000
2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Target number of shares	190,600
2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Target number of shares	154,000
2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Target number of shares	236,500
2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Target number of shares	192,000

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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