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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) $ in Thousands			3 Months Ended								12 Months Ended
	Nov. 01, 2019 Reporting_Unit	Jan. 02, 2019	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) Practice_Groups Reporting_Unit	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2016 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of practice groups | Practice_Groups											3
Revenue			$ 203,138	$ 239,790	$ 235,498	$ 269,998	$ 199,023	$ 224,249	$ 232,641	$ 266,090	$ 948,424	$ 922,003	$ 855,340
Maximum maturity period of investments											3 months
Allowance for doubtful accounts			14,379				13,389				$ 14,379	13,389	13,827		$ 13,508
Software purchased or developed, estimated useful life											7 years
Goodwill			588,213				564,300				$ 588,213	564,300	528,424
Total assets			1,400,774				1,183,031				1,400,774	1,183,031
Total stockholders' equity			659,238				$ 593,663				$ 659,238	593,663	530,879		$ 480,021
Intangible assets amortization period											6 years 6 months
Number of reporting units | Reporting_Unit	5										5
Net changes in the fair value of contingent consideration											$ (1,599)	(2,617)	1,494
Unsecured credit facility			$ 400,000								400,000
Operating lease, Percentage of office facilities		96.00%
Reclassification between AOCI and retained earnings													2,091
ASU 2018-02 [Member]
Summary Of Significant Accounting Policies [Line Items]
Reclassification between AOCI and retained earnings														$ 100
Other Expense [Member]
Summary Of Significant Accounting Policies [Line Items]
Net changes in the fair value of contingent consideration											$ (1,600)	(2,600)
Other Income [Member]
Summary Of Significant Accounting Policies [Line Items]
Net changes in the fair value of contingent consideration													1,500
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Shares vesting term											3 years
Intangible assets amortization period											2 years
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Shares vesting term											4 years
Intangible assets amortization period											15 years
Financial Service [Member]
Summary Of Significant Accounting Policies [Line Items]
Revenue											$ 157,600	$ 154,000	$ 156,400

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