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Acquisitions - Additional Information (Detail) (USD $) | 1 Months Ended |  |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended
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Aug. 31, 2012 | Aug. 31, 2013 | May 31, 2013 | Aug. 31, 2012 TCI Services, Inc. | Aug. 31, 2012 TCI Services, Inc. Customer relationships | Aug. 31, 2012 TCI Services, Inc. Trade names | Aug. 31, 2012 Specialty Remote Digital Video Inspection Company | Aug. 31, 2012 Specialty Remote Digital Video Inspection Company Customer relationships | Aug. 31, 2012 Specialty Remote Digital Video Inspection Company Non-compete agreements | Nov. 03, 2010 Quest Integrity | Nov. 03, 2010 Quest Integrity Minimum | Jul. 31, 2013 Global Ascent, Inc. | Jul. 31, 2013 Global Ascent, Inc. Customer relationships | Jul. 31, 2013 Global Ascent, Inc. Maximum
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, cash paid |  |  |  | $ 16,500,000 |  |  |  |  |  |  |  | $ 10,800,000 |  |
Business acquisition, additional consideration |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000
Business acquisition performance measurement period |  |  |  |  |  |  |  |  |  |  |  | 6 years |  |
Business acquisition, net working capital |  |  |  | 4,100,000 |  |  |  |  |  |  |  | 900,000 |  |
Business acquisition, fixed assets |  |  |  | 2,600,000 |  |  | 700,000 |  |  |  |  | 100,000 |  |
Business acquisition, goodwill |  | 108,977,000 | 103,466,000 | 8,600,000 |  |  | 900,000 |  |  |  |  | 5,800,000 |  |
Business acquisition, intangible assets |  |  |  |  | 6,700,000 | 1,100,000 |  | 1,100,000 | 300,000 |  |  |  | 6,000,000 |
Contingent consideration |  |  |  | 1,900,000 |  |  |  |  |  |  |  | 2,000,000 |  |
Business acquisition, purchase price | 26,000,000 |  |  | 23,200,000 |  |  | 3,000,000 |  |  |  |  |  |  |
Deferred payments for common stock |  |  |  | 6,700,000 |  |  |  |  |  |  |  |  |  |
Business acquisition, other current liabilities |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |
Business acquisition, other long-term liabilities |  |  |  | 5,700,000 |  |  |  |  |  |  |  |  |  |
Future contingent consideration liability | 1,000,000 |  |  | 1,900,000 |  |  |  |  |  |  |  |  |  |
Combined annual revenues from acquired businesses | 24,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, expected deductible goodwill recognized for tax purposes | 6,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase percentage of quest |  |  |  |  |  |  |  |  |  | 95.00% |  |  |  |
Remaining purchase consideration based upon future financial performance |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |
Expected date of purchase of remaining purchase consideration |  |  |  |  |  |  |  |  |  | 2015 |  |  |  |
Business acquisition, stock issued and issuable at fair value |  |  |  |  |  |  |  |  |  |  | 2,400,000 |  |  |
Percentage of aggregate value consideration of outstanding common stock |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |
Value of remaining acquisition |  |  |  |  |  |  |  |  |  | $ 4,900,000 |  |  |  |

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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 Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition The amount of liability arising from an inherited contingency (as defined) which has been recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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- Definition Amount of other liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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- Definition Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination. + References No definition available. + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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