Income Taxes - Roll Forward of Liability for Unrecognized Tax Benefits Exclusive of Accrued Interest (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Balance, beginning of period	$ 2,903	$ 1,982	$ 2,282
Increase in previous year tax positions	57	659
Increase in current year tax positions	144	151	83
Increase (decrease) related to adjustment of previous estimates of activity	6	111	(383)
Balance, end of period	$ 3,122	$ 2,903	$ 1,982