Business Combinations (Narrative) (Detail) shares in Thousands, $ in Thousands	1 Months Ended	6 Months Ended
	Dec. 21, 2016 USD ($) Contract Subsidiary shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)
Business Acquisition [Line Items]
Cash paid		$ 270,000
Number of shares to be issued | shares		5,122
Contingent consideration			$ 3,132	$ 2,952
Citron and Lucid
Business Acquisition [Line Items]
Number of national contracts with the Federal Government | Contract	18
Term of national contracts	5 years
Cash paid	$ 270,000
Deferred payment	$ 50,000
Interest rate	5.00%
Number of shares to be issued | shares	5,122
Purchase price, earn-out period	5 years
Purchase price, earn-out amount	$ 50,000
Contingent consideration			$ 3,045	$ 2,807
Rising Pharmaceuticals, Inc.
Business Acquisition [Line Items]
Number of subsidiary | Subsidiary	2