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Reconciliation of Beginning and Ending Fair Value Measurements of Level Three Contingent Earnout Arrangements Related to Company's Acquisitions (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Sep. 30, 2018 | Jun. 30, 2017
Contingent earnout arrangements |  |
Payment on earnout consideration | $ (2,500) | $ (2,000)
Fair Value, Inputs, Level 3 |  |
Business Acquisition Contingent Consideration [Line Items] |  |
Balance - beginning of period | 7,429 |
Contingent earnout arrangements |  |
Payment on earnout consideration | (2,500) |
Other earnout arrangement | 2,597 |
Balance - end of period | 7,021 |
Fair Value, Inputs, Level 3 | Other Expense, (Income) |  |
Contingent earnout arrangements |  |
Changes in fair value recorded in other expense, (income) | $ (505) |

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