Borrowings - Additional Information (Detail) (Credit Agreement, USD $) In Thousands, unless otherwise specified				1 Months Ended
	Nov. 30, 2013	Nov. 19, 2013	May 31, 2013	Nov. 19, 2013 J P Morgan Chase Bank	Nov. 19, 2013 J P Morgan Chase Bank Eurodollar	Nov. 19, 2013 J P Morgan Chase Bank CB Floating Rate	Nov. 19, 2013 J P Morgan Chase Bank Adjusted LIBO Rate
Line of Credit Facility [Line Items]
Maximum Outstanding Principal under Credit Agreement		$ 50,000		$ 25,000
Expiration Period of Credit Agreement				3 years
Credit Agreement Interest Rate Description				Borrowings under the Credit Agreement bear interest at a rate equal to, at our election, the applicable rate for a “Eurodollar Loan” or a “CB Floating Rate Loan.” Eurodollar Loan advances accrue interest at a per annum interest rate equal to (i) the quotient (rounded upwards to the next 1/16th of 1%) of (a) the applicable LIBO Rate, divided by (b) one minus the maximum aggregate reserve requirement (expressed as a decimal) imposed under Federal Reserve Board Regulation D (the “Adjusted LIBO Rate”), plus (ii) 0.75%. CB Floating Rate Loan advances accrue interest at a per annum interest rate equal to (i) the higher of (a) JPM’s Prime Rate or (b) the Adjusted LIBO Rate for a one month interest period plus 2.5%, minus (ii) 2.0%.
Debt Instrument, Basis Spread on Variable Rate					0.75%	2.50%	2.00%
Borrowing outstanding	$ 8,508		$ 10,000
Weighted average interest rate	1.05%		2.34%