Long-term Debt - Schedule of Maturities of Long Term Debt (Detail)	6 Months Ended
	Jun. 30, 2017 USD ($)
September 30, 2017-June 30, 2019 [Member]
Debt Instrument [Line Items]
Principal payment amount	$ 5,625,000
September 30, 2019-June 30, 2020 [Member]
Debt Instrument [Line Items]
Principal payment amount	8,437,500
September 30, 2020-March 31, 2022 [Member]
Debt Instrument [Line Items]
Principal payment amount	16,875,000
Term A Loan Maturity Date [Member]
Debt Instrument [Line Items]
Principal payment amount	$ 253,125,000