Debt - Additional Information (Detail)	1 Months Ended	6 Months Ended
	Oct. 25, 2013	Jun. 30, 2015 USD ($)	Feb. 15, 2013 USD ($)
Debt Disclosure [Line Items]
Maximum borrowing under PNC facility			$ 40,000,000
Fees and expenses relating to creation of PNC facility			50,000
Borrowings outstanding under PNC facility		$ 13,942,000
Available borrowing under PNC facility		$ 19,063,000
PNC Facility effective rate of interest		4.25%
Interest rate description under PNC facility		Interest charges with respect to loans are computed on the actual principal amount of loans outstanding during the month at a rate per annum equal to (A) with respect to Domestic Rate Loans (as defined in the PNC Facility), the sum of the Alternate Base Rate (as defined in the PNC Facility) plus one percent (1.00%) and (B) with respect to Eurodollar Rate Loans, the sum of the Eurodollar Rate plus 2.75%.
Debt Instrument, Maturity Date		Jun. 30, 2018
Minimum
Debt Disclosure [Line Items]
Fixed charge coverage ratio	1.00	1.00
Maximum
Debt Disclosure [Line Items]
Fixed charge coverage ratio	1.10	1.10
Term Loan
Debt Disclosure [Line Items]
Maximum borrowing under PNC facility			4,000,000
Term Loan | Base Rate
Debt Disclosure [Line Items]
Debt instrument, description of variable rate basis		Base Rate plus one percent
Term Loan | Eurodollar
Debt Disclosure [Line Items]
Debt instrument, description of variable rate basis		Eurodollar Rate plus two and three quarters of one percent
Revolving Credit Facility
Debt Disclosure [Line Items]
Maximum borrowing under PNC facility			$ 36,000,000
Revolving Credit Facility | Base Rate
Debt Disclosure [Line Items]
Debt instrument, description of variable rate basis		Base Rate (as defined in the PNC Facility) plus one percent
Revolving Credit Facility | Eurodollar
Debt Disclosure [Line Items]
Debt instrument, description of variable rate basis		Eurodollar Rate plus two and three quarters of one percent