Income Tax Expense - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Unrecognized tax benefits at the beginning of year	$ 111
Additions for tax positions of current year	51
Additions for tax positions of prior years
Reductions for tax positions of prior years
Reductions for lapses of the applicable statutes of limitations
Unrecognized tax benefits at the end of the period	$ 162