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Acquisitions - Additional Information (Detail) (USD $) | 0 Months Ended | 12 Months Ended |  |  | 0 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 08, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Beall Corporation | Feb. 04, 2013 Beall Corporation | May 08, 2012 Walker Group Holdings LLC | Dec. 31, 2013 Walker Group Holdings LLC | Dec. 31, 2012 Walker Group Holdings LLC | Apr. 25, 2013 Convertible Senior Notes | May 08, 2012 Convertible Senior Notes Walker Group Holdings LLC
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Walker acquisition, purchase price | $ 377,000,000 |  |  |  |  |  | $ 377,000,000 |  |  |  |
Notes issued, interest rate |  |  |  |  |  |  |  |  |  | 3.375% | 3.375%
Notes issued, due date |  |  |  |  |  |  |  |  |  | 2018 | 2018
Intangible assets preliminarily, Amount |  |  |  |  |  | 8,860,000 |  |  |  |  |
Acquisition expenses |  | 883,000 | 14,409,000 | 0 |  |  |  | 900,000 | 14,400,000 |  |
Goodwill |  |  |  |  |  | 1,784,000 |  |  |  |  |
Acquisition of goodwill amount |  |  |  |  |  |  | 148,500,000 |  |  |  |
Business acquisition cost of acquired entity purchase price |  |  |  |  |  | 13,931,000 |  |  |  |  |
Business acquisition, purchase price allocation, capital lease obligation accrual |  |  |  |  | 4,700,000 |  |  |  |  |  |
Business acquisition cost of revenue |  |  | 1,597,920,000 | 1,530,922,000 |  |  |  | 399,800,000 | 270,100,000 |  |
Intangible Assets Purchase Price Allocation |  | 162,800,000 |  |  |  |  | 162,800,000 |  |  |  |
Walker acquisition additional payment |  |  |  |  |  |  | 2,100,000 |  |  |  |
Business acquisitions pro forma income before income taxes |  |  |  |  |  |  |  | $ 50,800,000 | $ 34,400,000 |  |

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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition Business acquisitions cost of acquired entity purchase price + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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