Acquisitions (SAT) - Additional Information (Detail) - SAT Technology, Inc. ("SAT") [Member] - USD ($) $ in Millions		12 Months Ended
	Sep. 26, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Equity interests acquired	100.00%
Cash paid on acquisition	$ 1.4
Cash held back	0.2
Revenue from acquired entity		$ 2.4	$ 2.3	$ 1.0
Income from acquired entity		$ 1.1	$ (0.8)	$ 0.0
Maximum [Member]
Business Acquisition [Line Items]
Estimated fair value of earn out	$ 1.0