Employee Benefit Plans - Weighted-average Assumptions Used to Determine Benefit Obligations (Detail)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension Plan
Discount rate used to determine pension expense :
Discount rate	4.75%	4.00%	4.30%
Discount rate used to determine value of obligations
Discount rate	4.25%	4.75%	4.00%
Long term rate of return	7.50%	8.00%	8.50%
Retirement Plan \| La Barge
Discount rate used to determine pension expense :
Discount rate	4.00%	3.10%	3.75%
Discount rate used to determine value of obligations
Discount rate	3.70%	4.00%	3.10%

Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Expected Long Term Return on Assets

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- Definition

The interest rate used to adjust for the time value of money for the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)(1)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

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- Definition

The interest rate used to adjust for the time value of money.

+ References

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