Acquisitions - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 30, 2015	Dec. 31, 2014	Jul. 08, 2014
Business Acquisition [Line Items]
Goodwill	$ 146,421		$ 2,929
Clarient, Inc. [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
Path Logic [Member]
Business Acquisition [Line Items]
Current assets, including cash and cash equivalents				$ 1,722
Property and equipment				577
Identifiable intangible assets – customer relationships				1,930
Goodwill				2,929
Total assets acquired				7,186
Current liabilities				(1,180)
Long-term liabilities				(98)
Net assets acquired				5,908
Long term deposits				$ 28