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Subsequent Events - Schedule of Maturities of Long-term Debt (Detail) - Subsequent Event [Member] - SiriusDecisions, Inc [Member]
Jan. 03, 2019
USD ($)
Business Acquisition [Line Items]  
Long-term maturities, repayment of principal in year one $ 6,250,000
Long-term maturities, repayment of principal in year two 9,375,000
Long-term maturities, repayment of principal in year three 12,500,000
Long-term maturities, repayment of principal in year four 12,500,000
Long-term maturities, repayment of principal in year five 15,625,000
Long-term maturities, repayment of principal in thereafter $ 68,750,000