Goodwill and Intangibles - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2014 Scenario, Forecast [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expenses	$ 3,892	$ 3,785	$ 12,325	$ 11,534
Estimated Amortization Expenses					$ 16,000