Business Combinations - Recognition Based on Preliminary Analysis of Provisional Amounts (Parenthetical) (Detail) (Deferred payment, Basic Management Inc And Landwell, Face Value, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Deferred payment | Basic Management Inc And Landwell | Face Value
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Business combination consideration - liability incurred	$ 11.1