Commitments and Contingencies - Summary of Warranty Accrual Included in Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]
Balance at beginning of period	$ 4,292	$ 5,558	$ 4,811
Transfer to Aurora as part of the sale of discontinued operations	(939)	0	0
Accrual for current period warranties	7,158	5,798	8,245
Warranty costs incurred	(6,905)	(7,064)	(7,498)
Balance at end of period	$ 3,606	$ 4,292	$ 5,558