Income Taxes - Unrecognized Tax Benefits for Permanent and Temporary Book/Tax Differences for Continuing Operations, Exclusive of Interest (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 5,843	$ 8,314	$ 5,878
Additions for tax positions of the current year	714		230
Settlements for tax positions of prior years	(518)	(367)
Additions for tax positions of prior years	1,518	1,151	2,206
Reductions for tax positions of prior years		(942)
Statute lapses	(4,360)	(2,313)
Ending balance	$ 3,197	$ 5,843	$ 8,314