Taxes - Constituents of Provision for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Federal	$ 11,284	$ 6,711	$ 5,749
State	789	806	199
Foreign	5,790	10,519	7,740
Current income tax expense (benefit), Total	17,863	18,036	13,688
Deferred:
Federal	428	(812)	901
State	36	34	217
Foreign	205	(10)	(84)
Deferred income tax expense (benefit), Total	669	(788)	1,034
Income tax expense (benefit), continuing operations, Total	$ 18,532	$ 17,248	$ 14,722