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Acquisitions - Additional Information (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 07, 2019 | May 31, 2018 | Mar. 31, 2019 | Mar. 30, 2018 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |
Amortization of intangible assets |  |  | $ 1,800,000 | $ 20,900,000 |
Goodwill |  |  | 921,097,000 |  | $ 736,938,000
Revenues |  |  | 904,405,000 | $ 754,679,000 |
Polaris Alpha |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Percentage of ownership interest acquired |  | 100.00% |  |  |
Cash paid to acquire |  | $ 489,100,000 |  |  |
Borrowed under credit agreement to partially fund the acquisition |  | 260,000,000 |  |  |
Amortization of intangible assets |  |  | 13,700,000 |  |
Goodwill |  | $ 243,471,000 | 243,500,000 |  |
Goodwill deductible for tax purposes |  |  | 0 |  |
Revenues |  |  | 93,400,000 |  |
Polaris Alpha | Indirect, General and Administrative Expense |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquisition related expenses |  |  |  |  | $ 6,200,000
OGSystems |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Percentage of ownership interest acquired | 100.00% |  |  |  |
Cash paid to acquire | $ 292,400,000 |  |  |  |
Borrowed under credit agreement to partially fund the acquisition | 110,000,000 |  |  |  |
Amortization of intangible assets |  |  | 5,900,000 |  |
Goodwill | 183,567,000 |  | 183,600,000 |  |
Goodwill deductible for tax purposes |  |  | 16,000,000 |  |
Revenues |  |  | 29,000,000 |  |
OGSystems | Term Loan |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Borrowed under credit agreement to partially fund the acquisition | $ 150,000,000 |  |  |  |
OGSystems | Indirect, General and Administrative Expense |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquisition related expenses |  |  | $ 4,100,000 |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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