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Fair value of financial instruments - Assets, Liabilities and Temporary Equity Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets
Investments in mutual funds and common stock	$ 121,329	$ 107,050
Liabilities
Contingent earn-out obligations	8,955	$ 9,977
Fair Value, Measurements, Recurring
Assets
Investments in mutual funds and common stock	57,089
Cash surrender value of life insurance policies	64,240
Funds on deposit with third parties	76,456
Liabilities
Contingent earn-out obligations	8,955
Temporary equity
Noncontrolling interests subject to put provisions	1,026,890
Fair Value, Measurements, Recurring | Interest rate cap agreements
Assets
Interest rate cap agreements	962
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)
Assets
Investments in mutual funds and common stock	57,089
Cash surrender value of life insurance policies	0
Funds on deposit with third parties	76,456
Liabilities
Contingent earn-out obligations	0
Temporary equity
Noncontrolling interests subject to put provisions	0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Interest rate cap agreements
Assets
Interest rate cap agreements	0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)
Assets
Investments in mutual funds and common stock	0
Cash surrender value of life insurance policies	64,240
Funds on deposit with third parties	0
Liabilities
Contingent earn-out obligations	0
Temporary equity
Noncontrolling interests subject to put provisions	0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Interest rate cap agreements
Assets
Interest rate cap agreements	962
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)
Assets
Investments in mutual funds and common stock	0
Cash surrender value of life insurance policies	0
Funds on deposit with third parties	0
Liabilities
Contingent earn-out obligations	8,955
Temporary equity
Noncontrolling interests subject to put provisions	1,026,890
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Interest rate cap agreements
Assets
Interest rate cap agreements	$ 0

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of liability recognized arising from contingent consideration in a business combination.

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