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Summary of Significant Accounting Policies - Contract Assets and Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Contract assets	$ 680,006	$ 497,292
Contract liabilities	$ 452,491	$ 433,387

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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.

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

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