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Business Combinations - Acquisitions Accounted for Business Combinations (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Business Combination, Separately Recognized Transactions [Line Items] |  |
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents | $ 2,094 |
Cash Paid | 42,697 | $ 36,200
Business Acquisition Cost of Entity Note Payable | 492 |
Other Payable | 300 |
Recorded Earn-Out Payable | 606 |
Net Assets Acquired | 44,095 |
Maximum Potential Earn- Out Payable | 5,474 |
SSAD [Member] |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents | 2,094 |
Net Assets Acquired | $ 33,962 |
SSAD [Member] | Services [Member] |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Effective Date of Acquisition | Feb. 01, 2016 |
Cash Paid | $ 32,499 |
Business Acquisition Cost of Entity Note Payable | 492 |
Other Payable | 0 |
Recorded Earn-Out Payable | 971 |
Net Assets Acquired | 33,962 |
Maximum Potential Earn- Out Payable | 3,000 |
Other Acquisitions [Member] |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents | 0 |
Net Assets Acquired | 10,133 |
Other Acquisitions [Member] | Various |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Cash Paid | 10,198 |
Business Acquisition Cost of Entity Note Payable | 0 |
Other Payable | 300 |
Recorded Earn-Out Payable | (365) |
Net Assets Acquired | 10,133 |
Maximum Potential Earn- Out Payable | $ 2,474 |

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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e845-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Acquisition Date -URI http://asc.fasb.org/extlink&oid=6919109 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e848-128460 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + 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 (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: 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=73531372&loc=d3e2207-128464 Reference 2: 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=73530397&loc=d3e4845-128472 + 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=66902209&loc=d3e3213-108585 + Details
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