Business Segment Information - Segment Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total Assets	$ 561,420	$ 747,599
Goodwill and Intangibles	212,461	312,673
Operating Segments | SS
Segment Reporting Information [Line Items]
Total Assets	179,134	245,925
Goodwill and Intangibles	4,866	63,497
Operating Segments | ES
Segment Reporting Information [Line Items]
Total Assets	363,227	427,719
Goodwill and Intangibles	207,595	249,176
Corporate Administration
Segment Reporting Information [Line Items]
Total Assets	$ 19,059	$ 73,955