Significant Unobservable Inputs Used in Fair Value Measurement of Contingent Consideration (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Contingent Consideration FBM
Quantitative Information About Significant Unobservable Inputs [Line Items]
Fair Value	$ 330	$ 330
Valuation Technique	Discounted cash flow
Significant Unobservable Input	Annualized revenue and probability of achievement
Contingent Consideration CS
Quantitative Information About Significant Unobservable Inputs [Line Items]
Fair Value	6,671	6,488
Valuation Technique	Discounted cash flow
Significant Unobservable Input	Annualized revenue and probability of achievement
Contingent consideration BCI
Quantitative Information About Significant Unobservable Inputs [Line Items]
Fair Value	$ 11,963
Valuation Technique	Discounted cash flow
Significant Unobservable Input	Annualized revenue and probability of achievement