Commitments and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2014 Fair Value, Inputs, Level 3	Dec. 31, 2013 Fair Value, Inputs, Level 3
Loss Contingencies [Line Items]
Accrual for the probable payment of pending claims			$ 20,020
Loss from discontinued operations, net of tax	(3,777)	(3,777)
Fair value of contingent purchase price commitments				$ 19,265	$ 18,249