Line of Credit - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Abr Based Rate | Eurodollar/L I B O R Based Rate
Line Of Credit Facility [Line Items]
Line of credit facility, interest rate description	The principal amount outstanding under the Revolving Loan Facility is payable prior to or on the maturity date. Interest on the Revolving Loan Facility accrues at Eurodollar/LIBOR (beginning at L+3.75%) or Alternate Base Rate (“ABR”) (beginning at ABR +2.75%), which may be adjusted as provided in the Credit Agreement, payable monthly.
Revolving Credit Facility
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 30,000
Line of credit, maturity date	Mar. 31, 2018
Line of credit facility, amount outstanding	0	0
Line of credit facility, unused borrowing capacity	30,000	30,000
Revolving Credit Facility | Letter Of Credit Subfacility
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	10,000
Revolving Credit Facility | Swingline Subfacility
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 5,000
Revolving Credit Facility | Eurodollar/L I B O R Based Rate
Line Of Credit Facility [Line Items]
Interest rate above base	3.75%
Revolving Credit Facility | Abr Based Rate
Line Of Credit Facility [Line Items]
Interest rate above base	2.75%