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Scheduled Maturity for Debt Obligations (Detail)
$ in Thousands
Mar. 31, 2018
USD ($)
Debt Instrument [Line Items]  
2018 (remaining) $ 6,384
2019 8,709
2020 631,859
2021 9,799
2022 8,529
Thereafter 260,260
Total 925,540
Lines of Credit  
Debt Instrument [Line Items]  
2020 621,843
Total 621,843
Senior Notes  
Debt Instrument [Line Items]  
Thereafter 250,000
Total 250,000
Capital Lease Obligations  
Debt Instrument [Line Items]  
2018 (remaining) 6,384
2019 8,709
2020 10,016
2021 9,799
2022 8,529
Thereafter 10,260
Total $ 53,697