Long-Term Obligations - Senior Secured Term Loan Facility and Senior Secured Revolving Credit Facility - Additional Information (Detail) - Senior Secured Revolving Credit Facility [Member] - Revolving Credit Facility [Member] - 2021 [Member] - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Senior secured credit facility, aggregate principal amount	$ 300,000
Debt instrument maturity date	Jun. 17, 2021
Commitment fee	0.35%
Line Of Credit Facility Average Outstanding Amount		$ 5,000,000
London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Interest rate margins	2.25%
Floor rate	0.00%
Base Rate
Debt Instrument [Line Items]
Interest rate margins	1.25%
Minimum [Member] | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Interest rate margins	1.75%
Minimum [Member] | Base Rate
Debt Instrument [Line Items]
Interest rate margins	0.75%
Maximum [Member] | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Interest rate margins	2.50%
Maximum [Member] | Base Rate
Debt Instrument [Line Items]
Interest rate margins	1.50%