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Revenue from Contracts with Customers - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Revenue From Contract With Customer [Abstract] |  |  |  |  |
Contract assets | $ 220,800,000 |  | $ 220,800,000 |  | $ 330,900,000
Contract assets, current | 159,928,000 |  | 159,928,000 |  | 273,053,000
Contract assets moved to accounts receivable |  |  | (110,100,000) |  |
Contract liabilities | 97,300,000 |  | 97,300,000 |  | 100,600,000
Contract liabilities, current | 86,771,000 |  | 86,771,000 |  | $ 100,615,000
Recognized revenue included in contract liability |  |  | 78,100,000 |  |
Capitalized contract cost | 10,500,000 | $ 6,900,000 | 33,500,000 | $ 21,600,000 |
Capitalized contract cost, amortization of transaction cost | 5,400,000 | 5,200,000 | 17,600,000 | 12,400,000 |
Capitalized contract cost, impairment loss | $ 0 | $ 0 | $ 0 | $ 0 |

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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044 + Details
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