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Corporate Restructuring and Other Organizational Changes - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) Position | Dec. 31, 2014 USD ($) Position
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination costs paid during the period | $ 800 |  |
Employee termination costs |  | $ 1,300 | $ 8,700
Number of positions eliminated | Position |  | 30 | 220
Amounts paid during the period | 1,432 | $ 3,056 |
Restructuring charges | 4,559 | 1,045 | $ 2,793
Severance [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance liability to be paid over the next 12 months | 0 | 800 |
Amounts paid during the period | 778 | 2,872 |
Restructuring charges |  | 777 | 2,341
Facility Closures [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Amounts paid during the period | 654 | 184 |
Restructuring charges | 4,559 | 268 | 452
Facility Closures [Member] | Other Current Liabilities |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 1,100 |  |
Facility Closures [Member] | Other Noncurrent Liabilities |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 3,500 |  |
General and Administrative | Leased Facilities in Watford, UK; Providence, RI; Chantilly, VA; and West Hills, CA |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Lease termination fee | $ 5,000 |  |
Americas Segment [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination costs |  | 700 | 5,700
EMEA Segment [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination costs |  | $ 600 | 2,000
Asia/Pacific Segment [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination costs |  |  | $ 1,000

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