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Revenues - Outstanding Contract Asset and (Liability) Accounts (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Contract assets	$ 71,415	$ 80,796	$ 68,971	$ 73,039
Change in contract assets – increase	2,444	7,757
Contract liabilities	253,047	194,433	$ 215,093	$ 167,306
Change in contract liabilities – increase	(37,954)	(27,127)
Net change	$ (35,510)	$ (19,370)

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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

No definition available.

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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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
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Topic 230
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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