Accumulated Other Comprehensive Loss - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Equity [Abstract]
Comprehensive income (loss)	$ 0	$ 200,000	$ 0	$ 13,700,000
Reclassified comprehensive income loss, Before tax	0		(200,000)	200,000
Other comprehensive loss Pension liability, tax (expense) benefit				$ 4,200,000