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Acquisitions - Additional Information (Detail) (USD $) | 0 Months Ended | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  |
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May 08, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Feb. 04, 2013 Beall Corporation | Sep. 30, 2013 Walker Group Holdings LLC | Sep. 30, 2012 Walker Group Holdings LLC | Sep. 30, 2013 Walker Group Holdings LLC | Sep. 30, 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 |  |  |  |  |  |  |  |  |  |  |
Notes issued, interest rate |  |  |  |  |  |  |  |  |  |  | 3.375% | 3.375%
Notes issued, due date |  |  |  |  |  |  |  |  |  |  | 2018 | 2018
Intangible assets preliminarily, Amount |  |  |  |  |  | 8,860,000 |  |  |  |  |  |
Acquisition expenses |  | 26,000 | 172,000 | 883,000 | 14,074,000 |  |  |  |  |  |  |
Estimated amortization expense for 2013 |  | 21,700,000 |  | 21,700,000 |  |  |  |  |  |  |  |
Estimated amortization expense for 2014 |  | 21,900,000 |  | 21,900,000 |  |  |  |  |  |  |  |
Estimated amortization expense for 2015 |  | 21,300,000 |  | 21,300,000 |  |  |  |  |  |  |  |
Estimated amortization expense for 2016 |  | 20,100,000 |  | 20,100,000 |  |  |  |  |  |  |  |
Estimated amortization expense for 2017 |  | 16,900,000 |  | 16,900,000 |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 1,796,000 |  |  |  |  |  |
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 |  | 4,700,000 |  |  |  |  |  |  |  |
Amortization of intangibles |  | 5,454,000 | 2,984,000 | 16,278,000 | 7,175,000 |  |  |  |  |  |  |
Business acquisition cost of revenue |  |  |  |  | 1,182,073,000 |  | 102,300,000 | 96,500,000 | 300,600,000 | 140,800,000 |  |
Intangible Assets Purchase Price Allocation | 162,800,000 |  |  |  |  |  |  |  |  |  |  |
Walker acquisition additional payment | 2,100,000 |  |  |  |  |  |  |  |  |  |  |
Business acquisitions pro forma income before income taxes |  |  |  |  |  |  | $ 12,900,000 | $ 13,200,000 | $ 38,200,000 | $ 16,800,000 |  |

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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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