Commitments and Contingencies - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended			12 Months Ended
	Dec. 31, 2013 Prime and Federal Fund Rate [Member]	Dec. 31, 2013 London Interbank Offered Rate (LIBOR) [Member]	Dec. 31, 2013 Letter Of Credit [Member]	Oct. 10, 2012 Revolving Credit Agreement [Member]	Dec. 31, 2013 Credit Agreements [Member]	Dec. 31, 2012 Credit Agreements [Member]	Dec. 31, 2013 Minimum [Member]	Dec. 31, 2013 Minimum [Member] Prime and Federal Fund Rate [Member]	Dec. 31, 2013 Maximum [Member]	Dec. 31, 2013 Maximum [Member] Prime and Federal Fund Rate [Member]
Loss Contingencies [Line Items]
Operating lease term range							1 year		9 years
Revolving credit agreement in years				5 years
Revolving credit agreement amount				$ 250,000,000
Spread on federal funds effective rate	0.50%	1.00%
Ratio to total debt to EBITDA	Ranges from 0.00% to 0.75%
Percentage of total debt to EBITDA								0.00%		0.75%
Revolving credit agreement amount			$ 1,800,000		$ 0	$ 0