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Revenues - Outstanding Contract Asset and (Liability) Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Contract assets	$ 68,971	$ 73,039	$ 58,266
Change in contract assets – (decrease) increase	(4,068)	14,773
Contract liabilities	215,093	167,306	$ 146,162
Change in contract liabilities – increase	(47,787)	(21,144)
Net change	$ (51,855)	$ (6,371)

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- Definition

Amount of increase (decrease) in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

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-Publisher FASB
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-Section 50
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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ References

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