Commitments and Contingencies - Additional Information (Detail) (USD $)	12 Months Ended			1 Months Ended		12 Months Ended	1 Months Ended				12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 02, 2011 Pending or Threatened Litigation	Oct. 31, 2010 Pending or Threatened Litigation	Dec. 31, 2011 Pending or Threatened Litigation	Oct. 25, 2011 Court Proceeding	Dec. 02, 2011 Court Proceeding	Oct. 31, 2010 Court Proceeding	Oct. 31, 2010 Arbitration	Dec. 31, 2011 Maximum
Loss Contingencies [Line Items]
Noncancellable operating leases expiration year											2020
Rent expense	$ 10,400,000	$ 9,300,000	$ 8,600,000
Damage sought by Resolute as a result of alleged delayed payments					7,500,000
Relative proportion of total damages sought									55.00%	45.00%
Statutory interest rate							9.00%
Partial Summary Judgment Order								4,700,000
Interest expense accrual	$ 7,595,000	$ 2,327,000	$ 2,542,000	$ 4,700,000		$ 4,700,000