Debt - Additional Information (Detail) (USD $)	12 Months Ended										12 Months Ended	1 Months Ended		1 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 2013 Credit Facility	Dec. 31, 2012 2013 Credit Facility	Apr. 16, 2010 Senior Secured Revolving Credit Facility	Apr. 16, 2010 Senior Secured Term Loan Credit Facility	Dec. 31, 2013 Senior Secured Term Loan Credit Facility Fair Value, Inputs, Level 2	Dec. 31, 2012 Senior Secured Term Loan Credit Facility Fair Value, Inputs, Level 2	Dec. 31, 2012 Amended Senior Secured Credit Facility	Dec. 31, 2013 2013 Revolving Loan Facility	Jul. 31, 2013 2013 Term Loan Facility	Dec. 31, 2013 2013 Term Loan Facility	Jul. 31, 2013 ABR	Jul. 31, 2013 Eurodollar Rate Plus	Jul. 31, 2013 Federal Funds Rate Plus	Jul. 31, 2013 LIBOR	Dec. 31, 2013 2013 Credit Facility	Dec. 31, 2013 2013 Credit Facility Fair Value, Inputs, Level 2	Dec. 31, 2012 2013 Credit Facility Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Credit facility, borrowing capacity	$ 12,500,000					$ 215,000,000	$ 10,000,000			$ 45,000,000	$ 10,000,000		$ 230,000,000
Interest rate terms												Interest rates with respect to the term and revolving loans are based, at the Company’s option, on (a) adjusted LIBOR, provided that LIBOR shall be no less than 1% plus a maximum applicable margin of 3% or (b) ABR, provided that ABR shall be no less than 2%, which is equal to the greater of (1) JPMorgan Chase Bank, N.A.’s prime rate; (2) the Federal Funds Effective Rate plus 0.5% or (3) the calculated Eurodollar Rate plus 1.0%, plus a maximum applicable margin of 2%. The applicable margin will be adjusted quarterly beginning in the first quarter of 2014 based on the Company’s total leverage ratio as defined in the 2013 Senior Secured Credit Facility.
Interest rate	0.50%													2.00%	1.00%	0.50%
Applicable margin															2.00%		3.00%
Loss on early extinguishment of debt	(1,798,000)	(136,000)	(384,000)	(134,000)	(136,000)													(1,664,000)
Debt Instrument, unamortized discount																		3,327,000
Debt issuance costs, net																		1,345,000
Debt Instrument, expense incurred																		1,982,000
Excess Cash Flow payment	15,000,000
Principal payments are due on quarterly	575,000
Debt Instrument, Maturity Date	Jul. 31, 2020
Principal Excess Cash Flow prepayments	8,000,000	6,123,500
Revolving loan facility commitment fee on average daily amount of unused portion											0.50%
Credit Facility	4,256,000	9,285,000						228,404,000	232,326,000
Credit Facility, fair value																			$ 229,422,000	$ 233,046,000