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Related Parties - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Operating lease payments to related parties									$ 2,400	$ 3,000	$ 3,300
Revenue	$ 203,138	$ 239,790	$ 235,498	$ 269,998	$ 199,023	$ 224,249	$ 232,641	$ 266,090	948,424	922,003	855,340
Akin Gump [Member]
Related Party Transaction [Line Items]
Legal charges paid									200	200	200
CPA Firms [Member]
Related Party Transaction [Line Items]
Revenue									$ 157,600	$ 154,000	$ 156,400

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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