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Fair Value of Performance Units (Detail) - Performance Units Awards $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value at date of grant	$ 8,004
2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value at date of grant	5,780
2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value at date of grant	3,854
2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value at date of grant	4,052
2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value at date of grant	$ 5,388

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- Definition

Share based compensation arrangement by share based payment award grant date fair value of awards.

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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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