Basis of Presentation and Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2015

Accounting Policies [Abstract]

Summary of Supplemental Cash Flow Information

Supplemental Cash Flow Information

	Nine months ended September 30,
(in thousands)	2015			2014
Net cash paid for income taxes	$	5,860		$	5,427
Cash paid for interest expense	$	2,806		$	91
Acquisition-related activities:
Cash paid for acquisitions, excluding contingent consideration	$	71,869		$	22,653
Cash acquired in acquisitions		(6,389	)		(1,908	)
Net cash paid for acquisitions	$	65,480		$	20,745
Common stock issued in connection with the Reggiani acquisition	$	26,858		$	—
Non-cash investing and financing activities:
Non-cash settlement of vacation liabilities by issuing restricted stock units (“RSUs”)	$	1,353		$	—
Property and equipment received, but not paid		1,497			561
	$	2,850		$	561