Acquisitions - Summary of Final Amounts for the Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 30, 2015
Business Acquisition [Line Items]
Goodwill	$ 147,019	$ 146,421
Clarient, Inc. [Member]
Business Acquisition [Line Items]
Current assets, including cash and cash equivalents			$ 32,650
Property and equipment			19,177
Identifiable intangible assets – customer relationships			84,000
Goodwill			144,091
Total assets acquired			279,918
Current liabilities			(12,443)
Deferred tax liability			(18,868)
Long-term liabilities			(103)
Net assets acquired			248,504
Clarient, Inc. [Member] | Initially Reported [Member]
Business Acquisition [Line Items]
Current assets, including cash and cash equivalents			31,978
Property and equipment			19,241
Identifiable intangible assets – customer relationships			84,000
Goodwill			143,493
Total assets acquired			278,712
Current liabilities			(12,631)
Deferred tax liability			(17,904)
Long-term liabilities			(103)
Net assets acquired			248,074
Clarient, Inc. [Member] | Measurement Period Adjustments [Member]
Business Acquisition [Line Items]
Current assets, including cash and cash equivalents			672
Property and equipment			(64)
Goodwill			598
Total assets acquired			1,206
Current liabilities			188
Deferred tax liability			(964)
Net assets acquired			$ 430