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Note New Accounting Pronouncement - Additional Information (Detail) - USD ($) $ in Thousands		9 Months Ended
	Jan. 01, 2019	Sep. 30, 2018	Sep. 30, 2017	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle Line Items
Restricted Cash Money Market		$ 11,234	$ 8,944
Cumulative effect of accounting change						$ 1,935
ASU 2016-01
New Accounting Pronouncements Or Change In Accounting Principle Line Items
Cumulative effect of accounting change					$ 600
Reclassification From Trading And Available For Sale Securities To Equity Securities					$ 11,000
ASU 2016-02
New Accounting Pronouncements Or Change In Accounting Principle Line Items
New Accounting Pronouncement Or Change In Accounting Principle Effect Of Adoption Quantification	$ 200,000
ASU 2016-15
New Accounting Pronouncements Or Change In Accounting Principle Line Items
Reclassification From Operating To Investing Activities			500
ASU 2016-16
New Accounting Pronouncements Or Change In Accounting Principle Line Items
Cumulative effect of accounting change				$ 1,300
ASU 2017-07
New Accounting Pronouncements Or Change In Accounting Principle Line Items
Reclassification Other Components From Personnel To Other Operating Expenses		$ 6,700	$ 5,600

X

- Definition

Amount reclassified from operating to investing activities in the Consolidated Statement of Cash Flow as a result of electing the cumulative earnings approach for classifying distributions received from equity investees

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