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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands		6 Months Ended
	Jan. 02, 2018 USD ($)	Jun. 30, 2019 USD ($) Practice_Groups	Jun. 30, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of practice groups | Practice_Groups		3
New accounting pronouncements or adoption of new standard resulted a (decrease) increase in net cash provided by investing activities		$ (10,879)	$ (31,084)
Accounting Standards Update 2016-02 [Member]
Summary Of Significant Accounting Policies [Line Items]
New accounting pronouncements or adoption of new standard resulted a (decrease) increase in net cash provided by investing activities			73,600
New accounting pronouncements or adoption of new standard resulted a (decrease) increase in cash, cash equivalents and restricted cash	$ 148,900		$ 75,300

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Summary Of Significant Accounting Policies [Line Items]

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Amount of increase (decrease) in cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; excluding effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 230
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3521-108585

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3521-108585

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