Commitments and Contingencies - Schedule of Future Minimum Payments on Leases (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Future Minimum Lease Payments Under Capital Leases And Operating Leases For Continuing Operations [Line Items]
Capital Leases, 2013	$ 349
Capital Leases, 2014	35
Capital Leases, 2015
Capital Leases, 2016
Capital Leases, 2017
Capital Leases, Thereafter
Capital Leases, Total minimum lease payments	384
Less amounts representing interest	14
Present value of minimum lease payments included in long-term debt	370
Operating Leases, 2013	4,846
Operating Leases, 2014	3,606
Operating Leases, 2015	1,698
Operating Leases, 2016	857
Operating Leases, 2017	643
Operating Leases, Thereafter	1,417
Operating Leases, Total minimum lease payments	13,067
Total Capital and Operating Leases, 2013	5,195
Total Capital and Operating Leases, 2014	3,641
Total Capital and Operating Leases, 2015	1,698
Total Capital and Operating Leases, 2016	857
Total Capital and Operating Leases, 2017	643
Total Capital and Operating Leases, Thereafter	1,417
Total Capital and Operating Leases, minimum lease payments	$ 13,451