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Subsequent Event - Additional Information (Detail) - USD ($) | Jul. 31, 2018 | Dec. 23, 2016
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Revolving Credit Facility [Member] |  |
Subsequent Event [Line Items] |  |
Loan agreement, maturity date |  | Dec. 23, 2021
Loans maximum borrowing capacity |  | $ 300,000,000
Counsyl Inc [Member] | Amendment to Credit Agreement [Member] | Revolving Credit Facility [Member] | JPMorgan Chase Bank, N.A. [Member] |  |
Subsequent Event [Line Items] |  |
Loans maximum borrowing capacity |  | $ 300,000,000
Subsequent Event [Member] | Counsyl Inc [Member] | Agreement and Plan of Merger [Member] |  |
Subsequent Event [Line Items] |  |
Effective date of business acquisition | Jul. 31, 2018 |
Business acquisition consideration | $ 407,800,000 |
Cash payment on business acquisition | $ 280,400,000 |
Subsequent Event [Member] | Counsyl Inc [Member] | Agreement and Plan of Merger [Member] | Common Stock [Member] |  |
Subsequent Event [Line Items] |  |
Business acquisition, shares issued | 2,994,251 |
Business acquisition, shares issued, value | $ 127,300,000 |
Subsequent Event [Member] | Counsyl Inc [Member] | Amendment to Credit Agreement [Member] | Revolving Credit Facility [Member] | JPMorgan Chase Bank, N.A. [Member] |  |
Subsequent Event [Line Items] |  |
Loan agreement, maturity date | Jul. 31, 2023 |
Loans maximum borrowing capacity | $ 350,000,000 |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + 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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