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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Clearlake Capital Partners II (Master) L.P. | Management and Administrative Support Services |  |
Related Party Transaction [Line Items] |  |
Reimbursed out-of-pocket and other expenses | $ 20 | $ 7

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- Details
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