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Acquisitions - Additional Information (Detail) - USD ($) |  |  |  | 2 Months Ended | 3 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 11, 2015 | Oct. 31, 2014 | Oct. 25, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments of contingent consideration |  |  |  |  |  |  |  |  |  |  | $ 388,000
Goodwill |  |  |  | $ 273,438,000 |  |  | $ 488,413,000 | $ 488,413,000 | $ 488,413,000 | $ 273,438,000 |
ZTEC Instruments, Inc. |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  |  | $ 17,308,000 |  |  |  |  |  |  |  |
Cash paid to acquire outstanding common and preferred stock |  |  | 15,100,000 |  |  |  |  |  |  |  |
Contingent consideration |  |  | 2,200,000 |  |  |  |  |  |  |  |
Revenues |  |  |  |  | $ 400,000 |  |  |  |  |  |
Income (loss) before income taxes |  |  |  |  | $ (800,000) |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  | 163,394,000
Goodwill |  |  | 12,520,000 |  |  |  |  |  |  |  |
Avionics Interface Technologies, LLC |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  | $ 21,243,000 |  |  |  |  |  |  |  |  |
Cash paid to acquire outstanding common and preferred stock |  | 19,400,000 |  |  |  |  |  |  |  |  |
Contingent consideration |  | 1,800,000 |  |  |  |  |  |  |  |  |
Arrangement range of outcomes value high |  | $ 1,100,000 |  |  |  |  |  |  |  |  |
Revenues |  |  |  | 600,000 |  |  |  |  |  |  |
Income (loss) before income taxes |  |  |  | $ (800,000) |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 82,169,000 | $ 164,087,000
Discount rate |  | 4.70% |  |  |  |  |  |  |  |  |
Goodwill, expected tax deduction |  | $ 10,500,000 |  |  |  |  |  |  |  |  |
Goodwill |  | $ 10,516,000 |  |  |  |  |  |  |  |  |
Universal Robots |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total purchase price | $ 315,437,000 |  |  |  |  |  |  |  |  |  |
Cash paid to acquire outstanding common and preferred stock | 283,800,000 |  |  |  |  |  |  |  |  |  |
Contingent consideration | 31,600,000 |  |  |  |  |  |  |  |  |  |
Arrangement range of outcomes value high | 65,000,000 |  |  |  |  |  |  |  |  |  |
Decrease in goodwill |  |  |  |  |  |  | (5,400,000) |  |  |  |
Contingent consideration adjustment |  |  |  |  |  |  | (2,200,000) |  |  |  |
Increase in intangible assets |  |  |  |  |  |  | 1,600,000 |  |  |  |
Decrease in acquired liabilities |  |  |  |  |  |  | $ (1,600,000) |  |  |  |
Goodwill, not deductible for tax purposes | 221,100,000 |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  | 41,900,000 |  |  |
Income (loss) before income taxes |  |  |  |  |  |  |  | $ (7,600,000) |  |  |
Net income |  |  |  |  |  |  |  |  | 199,784,000 | 61,078,000 |
Goodwill | $ 221,128,000 |  |  |  |  |  |  |  |  |  |
Universal Robots | Fair Value Adjustment to Inventory |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | (1,600,000) | 1,600,000 |
Universal Robots | Acquisition Related Costs |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | $ (1,000,000) | $ 1,000,000 |
Universal Robots | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments of contingent consideration |  |  |  |  |  | $ 15,000,000 |  |  |  |  |
EBITDA contingent consideration amount, percentage |  |  |  |  |  | 100.00% |  |  |  |  |
Maximum | ZTEC Instruments, Inc. |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  | $ 5,000,000 |  |  |  |  |  |  |  |

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