Long-Term Debt - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended		9 Months Ended									9 Months Ended		9 Months Ended
	Apr. 30, 2012	Mar. 31, 2011	Sep. 30, 2012	Sep. 30, 2011	Nov. 04, 2011	Apr. 18, 2011	May 28, 2010	Sep. 30, 2012 Senior Notes [Member]	Jun. 30, 2012 Senior Notes [Member]	Mar. 16, 2011 Senior Notes [Member]	May 28, 2010 Senior Notes [Member]	Sep. 30, 2012 Term Loan [Member] Y	May 28, 2010 Term Loan [Member]	Sep. 30, 2012 Revolving Credit Facility [Member] Y	May 28, 2010 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit Facility			$ 12,000				$ 320,000						$ 290,000		$ 30,000
Duration of long term loan												6,000		5,000
Euro Dollar Margin			3.75%
Base Rate Margin			2.75%
Euro Dollar minimum floor rate			1.75%
Minimum floor on base rate			2.75%
Principal amount of senior note										50,000	150,000
Interest rate on senior note								10.875%	10.875%	10.875%
Premium on senior notes		4,625		4,625
Available senior facilities			12,759
Reduced secured leverage covenant						4.75
Basis point on term loan pricing						0.25%
Additional Basis point on term loan pricing						0.25%
Loan discount costs under amended senior facilities	1,250
Increase in aggregate term loan					30,000
Loan discount costs under incremental facility					750
Aggregate principal amount					$ 350,000