Future Minimum Lease Payments under Operating and Capital Leases (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Operating Leases
2013	$ 4,014
2014	3,064
2015	2,637
2016	2,353
2017	1,648
Thereafter	7,844
Total minimum lease payments	21,560
Capital Leases
2013	795	[1]
2014	795	[1]
2015		[1]
2016		[1]
2017		[1]
Thereafter		[1]
Total minimum lease payments	$ 1,590	[1]

[1] Capital lease payments include interest payments of less than $0.1 million.