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Summary of Contract Balances (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Contract With Customer Asset And Liability [Abstract]
Total receivables, net	$ 137,328	$ 109,605
Contract assets	3,000
Deferred revenue	$ 609	$ 14,574

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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, classified as current.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.

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