Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended			9 Months Ended	3 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2014	Jun. 30, 2013	Sep. 30, 2014 Maximum [Member]	Jun. 30, 2014 PMI Acquisition [Member]
Current Income Tax Expense Benefit Continuing Operations [Line Items]
Percentage of non-qualifying income					10.00%
Valuation allowance against deferred tax assets			$ 1.9
Valuation allowance adjustments	0.9	0.3				5.2
Net deferred tax asset				10.4
Net of deferred tax liability	$ 5.9	$ 5.9