Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2014	Jan. 14, 2008
Loss Contingencies [Line Items]
Adverse effect on earnings per share resulting from changing sales forecasts						$ 1.00
Costs relating to delayed delivery of product	$ 10,000,000	$ 0	$ 14,700,000	$ 14,700,000
Gains relating to contingency			6,100,000	6,100,000
Amount of potential liability including interest	1,400,000		1,400,000
Potential payments remitted during period	0		0		12,000,000
Cost of Sales [Member]
Loss Contingencies [Line Items]
Reduction in estimated accruals	$ 15,900,000		$ 15,900,000