Summary of Future Lease Commitments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Future Minimum Payments Under Non-Cancelable Operating Leases With Initial Terms Of One-Year Or More [Line Items]
2013	$ 7,179
2014	6,469
2015	5,275
2016	5,003
2017	4,831
Thereafter	8,491
Minimum payments required	37,248	[1]
Sublease rentals	$ 1,919

[1] Minimum payments have not been reduced by sublease rentals of $1,919 due in the future under noncancelable subleases.