Line of Credit - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended			3 Months Ended			3 Months Ended
	Sep. 30, 2014	Sep. 30, 2014 Other non-current assets [Member]	Dec. 31, 2013 Other non-current assets [Member]	Sep. 30, 2014 Senior Credit Facility [Member]	Aug. 10, 2012 Senior Credit Facility [Member]	Sep. 30, 2014 Senior Credit Facility [Member] Scenario, previously reported [Member]	Sep. 30, 2014 Senior Credit Facility [Member] Federal funds rate [Member]	Sep. 30, 2014 Senior Credit Facility [Member] LIBOR [Member]	Sep. 30, 2014 Senior Credit Facility [Member] LIBOR [Member] Maximum [Member]	Sep. 30, 2014 Senior Credit Facility [Member] LIBOR [Member] Minimum [Member]	Sep. 30, 2014 Senior Credit Facility [Member] Base rate loans [Member] Maximum [Member]	Sep. 30, 2014 Senior Credit Facility [Member] Base rate loans [Member] Minimum [Member]
Line of Credit Facility [Line Items]
Senior Credit Facility					$ 140.0
Senior Credit Facility, maturity date				Aug. 10, 2017
Deferred financing costs		0.9	1.2	1.0		0.6
Base rate							0.50%	1.00%
Senior Credit Facility, applicable margin									2.50%	1.25%	1.50%	0.25%
Senior Credit Facility, adjusted EBITDA ratio				3
Senior Credit Facility, interest coverage ratio				3
Amount available under the Senior Credit Facility	$ 39.6
Line of credit facility covenant compliance	the Company was in compliance with all financial covenants.