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Restructuring - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |  | 0 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Mar. 31, 2014 September 2013 Restructuring Initiatives [Member] Employees | Feb. 28, 2014 September 2013 Restructuring Initiatives [Member] Employees | Sep. 30, 2014 September 2013 Restructuring Initiatives [Member] | Jun. 30, 2014 September 2013 Restructuring Initiatives [Member] Employees | Sep. 30, 2014 September 2013 Restructuring Initiatives [Member] | Sep. 30, 2014 September 2013 Restructuring Initiatives [Member] | Dec. 31, 2013 September 2013 Restructuring Initiatives [Member] | Sep. 30, 2014 September 2013 Restructuring Initiatives [Member] Employee Severance Costs [Member] | Sep. 30, 2014 September 2013 Restructuring Initiatives [Member] Facility Exit Related Costs [Member] | Sep. 30, 2014 September 2014 Restructuring Initiatives [Member] | Sep. 30, 2014 September 2014 Restructuring Initiatives [Member] Chief Executive Officer [Member] | Sep. 30, 2014 September 2014 Restructuring Initiatives [Member] Chief Executive Officer [Member]
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in number of employees after restructuring |  |  |  |  |  | 21 | 41 |  | 5 |  |  |  |  |  |  |  |
Restructuring charges | $ 1,064,000 | $ 2,411,000 | $ 7,480,000 | $ 2,411,000 |  |  |  | $ 87,000 |  | $ 2,600,000 | $ 5,900,000 | $ 3,300,000 | $ 1,700,000 | $ 917,000 |  | $ 1,100,000 | $ 4,800,000
Expense related to accelerated vesting of restricted stock |  |  | 1,298,000 |  |  |  |  |  |  |  |  |  | 0 |  | 1,300,000 |  |
Restructuring liability current | 3,909,000 |  | 3,909,000 |  | 610,000 |  |  |  |  |  |  |  |  |  |  |  |
Restructuring liability non-current | $ 414,000 |  | $ 414,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Restructuring Charges For Shared Based Compensation Acceleration For Termination Of Chief Executive Officer + References No definition available. + Details
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- Definition The number of positions eliminated during the period as a result of restructuring activities. + References No definition available. + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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- Definition Carrying amount as of the balance sheet date of known and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid after one year or beyond the next operating cycle, if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Paragraph Question 4 + Details
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