Commitments - Future Minimum Annual Lease Payments Under All Leases (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Commitments and Contingencies Disclosure [Line Items]
Future minimum annual Lease payments due in 2012	$ 42,152
Future minimum annual Lease payments due in 2013	25,546
Future minimum annual Lease payments due in 2014	13,668
Future minimum annual Lease payments due in 2015	8,827
Future minimum annual Lease payments due in 2016	3,615
Future minimum annual Lease payments due Thereafter	14,493
Operating Leases, Future Minimum Payments Due, Total	$ 108,301