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Schedule of Carrying Value of Trust Assets, Including Unrealized Gains or Losses (Detail) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract]
Investments held in Rabbi Trust at fair value	[1]	$ 8,809	$ 8,908
Unrealized gains (losses) in fair value of trust assets		(43)	256
Obligations under the supplemental plan		$ 32,581	$ 32,508
[1] The company converted all investments held in the rabbi trust to cash to fund a lump sum benefit to the former CEO in May 2018. Refer to Note (6) for more information regarding this payment.

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- Definition

Defined Benefit Plan Supplemental Plan Obligations

+ References

No definition available.

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- Definition

Trust assets, carrying value, net

+ References

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- References

No definition available.

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- Definition

Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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