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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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-Publisher FASB

-Name Accounting Standards Codification

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Contractual interest rate for funds borrowed, under the debt agreement.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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Business acquisition purchases price allocation capital lease obligation accrual.

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No definition available.

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Business acquisition purchases price allocation goodwill amount.

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Business acquisition purchases price allocation intangible assets other than goodwill.

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Business acquisitions cost of acquired entity purchase price.

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The pro forma Income before income taxes for the period as if the business combination or combinations had been completed at the beginning of a period.

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Debt instrument maturity year.

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Intangible assets purchase price allocation.

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Payments to acquire businesses additional payment.

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Acquisitions - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended
Acquisitions - Additional Information (Detail) (USD $)	May 08, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 04, 2013
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$ 377,000,000
Intangible Assets Purchase Price Allocation		162,800,000
Business Acquisition, Pro Forma Revenue				1,597,920,000
Business Combination, Acquisition Related Costs		0	883,000	14,409,000
Walker Group Holdings LLC
Business Acquisition [Line Items]
Payments To Acquire Businesses Additional Payment	2,100,000
Business Acquisitions Pro Forma Income Before Income Taxes				34,400,000
Business Acquisition Purchases Price Allocation Intangible Assets Other Than Goodwill	162,800,000
Business Acquisition Purchases Price Allocation Goodwill Amount	148,498,000
Payments to Acquire Businesses, Gross	377,000,000
Intangible Assets Purchase Price Allocation	162,800,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount	148,500,000
Business Acquisition, Pro Forma Revenue				270,100,000
Business Combination, Acquisition Related Costs			900,000	14,400,000
Beall Corporation [Member]
Business Acquisition [Line Items]
Business acquisitions cost of acquired entity purchase price					13,900,000
Business Acquisition Purchases Price Allocation Capital Lease Obligation Accrual		4,700,000
Business Acquisition Purchases Price Allocation Intangible Assets Other Than Goodwill					8,900,000
Business Acquisition Purchases Price Allocation Goodwill Amount					1,800,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount					$ 1,784,000
Convertible Senior Notes \| Walker Group Holdings LLC
Business Acquisition [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.375%
Debt Instrument Maturity Year	2018