Income Taxes - Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Income Tax Disclosure [Line Items]
Unrecognized tax positions at beginning of period	$ 186	$ 186	$ 186
Increases in tax positions from prior years
Decreases in tax positions from prior years	181
Increases in tax positions from current year
Settlements with taxing authorities
Lapse in statute of limitations
Unrecognized tax positions at end of period	$ 5	$ 186	$ 186