Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Accounting Policies [Abstract]
Allowance for doubtful accounts	$ 784		$ 784		$ 703
Accumulated depreciation	0		0		61,370
Shipping and handling costs	$ 8,557	$ 7,142	$ 14,890	$ 12,756