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Acquisitions - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |  | 0 Months Ended | 3 Months Ended | 9 Months Ended |  | 9 Months Ended
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Sep. 28, 2014 | Sep. 29, 2013 | Sep. 28, 2014 | Sep. 29, 2013 | Dec. 31, 2013 | Feb. 03, 2014 Mayo Healthcare Pty Limited | Sep. 28, 2014 Mayo Healthcare Pty Limited | Sep. 28, 2014 Mayo Healthcare Pty Limited | Feb. 03, 2014 Mayo Healthcare Pty Limited | Sep. 28, 2014 Mayo Healthcare Pty Limited Customer Lists
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of the consideration at the date of acquisition |  |  |  |  | $ 307,000,000 |  |  |  | $ 28,500,000 |
Initial payment |  |  |  |  |  | 29,000,000 |  |  |  |
Working capital adjustment related to acquisition |  |  |  |  |  | 500,000 |  |  |  |
Transaction expenses |  |  |  |  |  |  |  | 300,000 |  |
Net revenues | 457,173,000 | 413,796,000 | 1,363,824,000 | 1,245,732,000 |  |  | 6,500,000 | 19,900,000 |  |
Income (loss) from continuing operations before taxes | $ 64,912,000 | $ 50,988,000 | $ 167,551,000 | $ 135,839,000 |  |  | $ (700,000) | $ 3,100,000 |  |
Useful life of intangible assets acquired, years |  |  |  |  |  |  |  |  |  | 10 years

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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- Definition The expenses and losses recorded for each transaction with the acquiree that was recognized separately from the acquisition of assets and assumptions of liabilities in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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