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Employee Benefit Plans - Summary of Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Amounts recognized in accumulated comprehensive income:
Accumulated net actuarial loss	$ 465
Income tax benefit	199
Accumulated other comprehensive loss	$ 266	[1]
[1] Tax benefit was $(199) for the year ended December 31, 2016 and $0 for 2015 and 2014.

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- Definition

Amount before tax, after reclassification adjustments, of actuarial gain (loss) that has not been recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580

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-Section 50
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-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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- Definition

Amount after tax and reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans, attributable to parent entity.

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-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569616-111683

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Amount of tax (expense) benefit, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

+ References

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