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Recent Accounting Pronouncements (Detail) - Accounting Standards Update 2016-09 $ in Thousands	Dec. 31, 2016 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative adjustment from implementation of ASU 2016-09	$ 4,203
Accumulated Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative adjustment from implementation of ASU 2016-09	$ 4,203

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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