Indebtedness - Summarizes Total Payments under Company's Debt Arrangements (Detail) $ in Thousands	Sep. 30, 2017 USD ($)
Debt Instrument [Line Items]
2017	$ 2,906
2018	6,389
2019	11,611
2020	10,855
2021	5,980
Total Payments	37,741
Term Loan [Member]
Debt Instrument [Line Items]
2017	573	[1]
2018	6,389	[1]
2019	11,611	[1]
2020	10,855	[1]
2021	5,980	[1]
Total Payments	35,408	[1]
Mortgage Loans [Member]
Debt Instrument [Line Items]
2017	1,307	[1]
Total Payments	1,307	[1]
Revolver [Member]
Debt Instrument [Line Items]
2017	1,026	[1]
Total Payments	$ 1,026	[1]

[1] Includes interest