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Acquisitions - Additional Information (Detail) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2016 USD ($) Milestone | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jun. 30, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Cash payment on acquisition |  |  |  |  | $ 216.1 |
Change in non-controlling interest |  |  |  | $ 1.9 |  |
Assurex [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Date of acquisition agreement | Aug. 31, 2016 |  |  |  |  |
Total consideration transferred | $ 351.6 |  | $ 351.6 |  |  |
Business acquisition, net cash acquired | 5.5 |  | 5.5 |  |  |
Cash payment on acquisition | $ 216.1 |  |  |  |  |
Number of potential performance-based milestones | Milestone | 2 |  |  |  |  |
Additional payments upon completion of performance based milestones | $ 185.0 |  |  |  |  |
Contingent consideration | 130.0 |  | 130.0 |  |  |
Contingent consideration, valuation method |  |  |  | The fair value of the performance-based milestones was determined by using the Monte Carlo Method. |  |
Amount of cash consideration deposited in escrow account | $ 19.1 |  |  |  |  |
Fair value increase to equipment |  |  | (0.1) | $ (0.1) |  |
Change in non-controlling interest |  |  | 0.2 | 0.2 |  |
Net increase to goodwill due to change in non-controlling interest |  |  | 0.1 |  |  |
Increase in deferred tax liability due to differences in GAAP and tax purchase accounting |  |  | 1.8 | $ 1.8 |  |
Acquired intangible assets |  |  | $ 295.6 |  |  |
Estimated net cash flows, discount rate |  |  |  | 16.00% |  |
Acquisition costs |  |  |  |  |  | $ 5.0
Revenue contributed by acquired entity |  | $ 31.7 |  | $ 60.5 |  |
Operating expenses related to acquired entity |  | 29.2 |  | 58.9 |  |
Assurex [Member] | Developed Technology [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired intangible assets |  | 256.5 |  | $ 256.5 |  |
Intangible assets estimated useful lives |  |  |  | 17 years |  |
Assurex [Member] | Database [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired intangible assets |  | $ 39.1 |  | $ 39.1 |  |
Intangible assets estimated useful lives |  |  |  | 5 years |  |

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