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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	Mar. 31, 2018	Dec. 31, 2017
Assets
Investments in mutual funds and common stock	$ 35,544	$ 38,895
Liabilities
Contingent earn-out obligations	6,562	$ 6,388
Fair Value, Measurements, Recurring
Assets
Investments in mutual funds and common stock	35,544
Liabilities
Contingent earn-out obligations	6,562
Temporary equity
Noncontrolling interests subject to put provisions	1,034,501
Fair Value, Measurements, Recurring | Interest rate cap agreements
Assets
Interest rate cap agreements	2,446
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)
Assets
Investments in mutual funds and common stock	35,544
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
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	2,446
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)
Assets
Investments in mutual funds and common stock	0
Liabilities
Contingent earn-out obligations	6,562
Temporary equity
Noncontrolling interests subject to put provisions	1,034,501
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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