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Commitments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments And Contingencies Disclosure [Abstract]
Rent expenses	$ 3.4us-gaap_OperatingLeasesRentExpenseNet	$ 3.4us-gaap_OperatingLeasesRentExpenseNet	$ 4.1us-gaap_OperatingLeasesRentExpenseNet
Inventory purchase commitments with third-party	$ 2.5	$ 3.0	$ 1.4

Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

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