The Company and Significant Accounting Policies - Additional Information 1 (Detail) (USD $)	3 Months Ended			9 Months Ended		12 Months Ended				9 Months Ended						9 Months Ended		9 Months Ended	12 Months Ended			9 Months Ended		1 Months Ended		9 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Dec. 20, 2012	Sep. 30, 2013 8.75% Senior Secured First Lien Notes [Member]	Sep. 30, 2013 Prior to August 1, 2013 Term One [Member] 8.75% Senior Secured First Lien Notes [Member]	Sep. 30, 2013 Prior to August 1, 2013, Term Two [Member] 8.75% Senior Secured First Lien Notes [Member]	Sep. 30, 2013 Prior to August 1, 2013, Term Three [Member] 8.75% Senior Secured First Lien Notes [Member]	Sep. 30, 2013 Twelve Months Beginning August 1, 2013, Term Four [Member] 8.75% Senior Secured First Lien Notes [Member]	Sep. 30, 2013 Twelve Months Beginning August 1, 2014, Term Four [Member] 8.75% Senior Secured First Lien Notes [Member]	Sep. 30, 2013 Twelve Months Beginning August 1, 2015, Term Four [Member] 8.75% Senior Secured First Lien Notes [Member]	Sep. 30, 2013 Twelve Months Beginning August 1, 2016, Term Four [Member] 8.75% Senior Secured First Lien Notes [Member]	Sep. 30, 2013 2013 Credit Facility [Member]	May 31, 2013 2013 Credit Facility [Member]	Sep. 30, 2013 2012 Credit Facility [Member]	Dec. 31, 2012 2012 Credit Facility [Member]	May 31, 2013 2012 Credit Facility [Member]	Dec. 20, 2012 2012 Credit Facility [Member]	Sep. 30, 2013 Term Loan B Facility [Member] 2013 Credit Facility [Member]	Sep. 30, 2013 Letter of credit [Member]	May 31, 2013 Term Loan A [Member] 2013 Credit Facility [Member]	May 31, 2013 Term Loans B [Member] 2013 Credit Facility [Member]	Sep. 30, 2013 Senior Secured Revolving Credit Facility [Member] 2013 Credit Facility [Member]	May 31, 2013 Senior Secured Revolving Credit Facility [Member] 2013 Credit Facility [Member]	Sep. 30, 2013 Senior Secured Revolving Credit Facility [Member] 2013 Credit Facility [Member] Base Rate Margin [Member]	Sep. 30, 2013 Senior Secured Revolving Credit Facility [Member] 2013 Credit Facility [Member] LIBOR Margin [Member]	Sep. 30, 2013 Term Loan B Facility [Member] 2013 Credit Facility [Member]	Sep. 30, 2013 Term Loan [Member] 2013 Credit Facility [Member]	Sep. 30, 2013 Term Loan [Member] 2013 Credit Facility [Member] Base Rate Margin [Member]	Sep. 30, 2013 Term Loan [Member] 2013 Credit Facility [Member] LIBOR Margin [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Rate on priority on principal amount with net proceeds at redemption									10.00%	35.00%
Redemption price on principal amount with net proceeds, accrued and unpaid expense									103.00%	108.75%	100.00%	106.563%	104.375%	102.188%	100.00%
Rate on principal amount outstanding										65.00%
Redemption closing date										60 days
Redemption of Notes upon change in control, amount as percentage of principal amount including interest								101.00%
Redemption of Notes declaration of acceleration written percentage of principal amount								25.00%
Interest expense related to amortization of the bond discount	$ 0	$ 100,000		$ 300,000	$ 400,000
Senior Secured debt																				405,000,000	50,000,000			20,000,000	375,000,000		30,000,000
Maturity date of revolving credit facility																		May 31, 2013	Dec. 20, 2016			May 31, 2020		Aug. 01, 2013		May 31, 2018				May 31, 2020
2012 Credit Facility, obligations							20,000,000														30,000,000		3,000,000
Period of revolving credit facility						4 years
Additional borrowing capacity																	100,000,000
Effective interest rate																3.50%
Variable interest rate basis spread on debt																												1.50%	2.50%			1.50%	2.50%
Interest rate on borrowings under 2013 Credit Facility																										If a Base Rate Loan, one and one half percent (1.50%) per annum and (B) if a LIBOR Rate Loan, two and one half percent (2.50%) per annum;					If a Base Rate Loan, one and one half percent (1.50%) per annum and (ii) if a LIBOR Rate Loan, two and one half percent (2.50%) per annum;
Period considered for applicability of repricing fees																						6 months								6 months
Percentage of Repricing Fee																1.00%
Certain customary events of default, number of business days to default in the payment of interest on borrowings																3 days
Certain customary events of default, number of days default continue for compliance with other agreement																30 days
Certain customary events of default, number of days default continue for financial statement delivery obligations																10 days
Certain customary events of default ,indebtedness aggregate amount																15,000,000
Certain customary events of default ,failure in payment of final judgments aggregate amount																15,000,000
Certain customary events of default ,failure in payment of final judgments aggregate amount period																30 days
Principal amount repurchased	324,000,000		16,200,000	324,000,000
Gain (loss) on debt extinguishment	(29,404,000)		(400,000)	(29,534,000)	(1,230,000)
Carrying value of term loan																														375,000,000
Estimated fair value of term loan																														$ 372,000,000