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Revenue from Contracts with Customers - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Revenue From Contract With Customer [Abstract]
Contract assets	$ 169,300,000		$ 169,300,000		$ 330,900,000
Contract assets, current	109,272,000		109,272,000		273,053,000
Contract assets moved to accounts receivable			(161,700,000)
Contract liabilities	86,800,000		86,800,000		100,600,000
Contract liabilities, current	76,216,000		76,216,000		$ 100,615,000
Recognized revenue included in contract liability			64,100,000
Capitalized contract cost	13,400,000	$ 5,800,000	23,000,000	$ 14,700,000
Capitalized contract cost, amortization of transaction cost	6,200,000	3,600,000	12,200,000	7,200,000
Capitalized contract cost, impairment loss	$ 0	$ 0	$ 0	$ 0

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- Definition

Capitalized transition costs.

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- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
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Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer.

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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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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 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 from transfer to receivable due to right to consideration becoming unconditional.

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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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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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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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