Quarterly report pursuant to Section 13 or 15(d)

Debt Obligations - Long-term Debt Obligations (Detail)

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Debt Obligations - Long-term Debt Obligations (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Borrowings under credit facility $ 840,198 $ 668,427
Other long-term debt, interest rate of 2.4% 1,657 1,810
Capital leases, interest rates ranging from 2.5% to 3.8% 1,464 1,704
Total long-term debt obligations 843,319 671,941
Less — Current maturities of long-term debt 2,577 1,220
Total long-term debt obligations, net of current maturities $ 840,742 $ 670,721
Other Long Term Debt    
Debt Instrument [Line Items]    
Capital leases and Other long-term debt interest rates 2.40% 2.40%
Capital Leases | Minimum    
Debt Instrument [Line Items]    
Capital leases and Other long-term debt interest rates 2.50% 2.50%
Capital Leases | Maximum    
Debt Instrument [Line Items]    
Capital leases and Other long-term debt interest rates 3.80% 3.80%