Goodwill (Changes in Goodwill) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Balance, beginning of year, Goodwill, gross	$ 328,008	$ 328,129
Balance, beginning of year, Accumulated impairment lossses	(310,653)	(310,653)
Balance, beginning of year, Goodwill, Net	17,355	17,476
Increases (decreases) due to current year acquisitions (disposals)	(3,620)	460
Effects of foreign currency translation	(655)	(581)
Total goodwill increase (decrease)	(4,275)	(121)
Balance, end of year, Goodwill, gross	323,733	328,008
Balance, end of year, Accumulated impairment lossses	(310,653)	(310,653)
Balance, end of year, Goodwill, Net	$ 13,080	$ 17,355