Quantitative Information about Significant Unobservable Input used in Fair Value Measurement for Contingent Consideration Liability Measured at Fair Value on Recurring Basis (Detail) - Significant Unobservable Inputs (Level 3) [Member]	9 Months Ended
	Sep. 30, 2015
Minimum [Member]
Business Acquisition, Contingent Consideration [Line Items]
Revenue and expense growth percentage	(1.00%)
Maximum [Member]
Business Acquisition, Contingent Consideration [Line Items]
Revenue and expense growth percentage	102.00%