Goodwill and Intangibles - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expenses	$ 3,599	$ 3,892	$ 10,819	$ 12,325
Scenario, Forecast [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Amortization Expenses					$ 14,400