Line of Credit - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Aug. 10, 2012 USD ($)
Line of Credit Facility [Line Items]
Line of Credit Facility, Funded Debt	$ 15,000,000
Long-term Line of Credit	0
Line of Credit Facility, Remaining Borrowing Capacity	0
Other non-current assets [Member]
Line of Credit Facility [Line Items]
Deferred financing costs	100,000	$ 200,000
Other Current Assets [Member]
Line of Credit Facility [Line Items]
Deferred financing costs	$ 300,000	$ 300,000
Senior Credit Facility [Member]
Line of Credit Facility [Line Items]
Senior Credit Facility			$ 140,000,000
Senior Credit Facility, maturity date	Aug. 10, 2017
Deferred financing costs	$ 1,000,000
Senior Credit Facility, adjusted EBITDA ratio	3
Senior Credit Facility, interest coverage ratio	3
Senior Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Senior Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Senior Credit Facility, applicable margin	1.25%
Senior Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Senior Credit Facility, applicable margin	2.50%
Senior Credit Facility [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.50%
Senior Credit Facility [Member] | Base rate loans [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Senior Credit Facility, applicable margin	0.25%
Senior Credit Facility [Member] | Base rate loans [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Senior Credit Facility, applicable margin	1.50%