Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Nov. 04, 2016
Business Acquisition [Line Items]
Additional goodwill recognized	$ 34,892
Measurement period adjustments	(16,276)
Lucera [Member]
Business Acquisition [Line Items]
Ownership percentage acquired			80.00%
Other Acquisitions [Member]
Business Acquisition [Line Items]
Total consideration transferred	81,400	$ 139,000
Business acquisition, contingent cash consideration	7,400	28,100
Additional goodwill recognized	34,900	$ 37,100
Measurement period adjustments	$ 16,300