Debt Obligations - Long-term Debt Obligations (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Debt Disclosure [Abstract]
Borrowings under credit facility	$ 398,028	$ 466,850
Other long-term debt, interest rates ranging from 3.5% to 4.3%	3,917	5,401
Capital leases, interest rates ranging from 2.5% to 6.2%	4,777	5,351
Total long-term debt obligations	406,722	477,602
Total long-term debt obligations	406,722	477,602
Less - Current maturities of long-term debt	5,603	2,238
Total long-term debt obligations, net of current maturities	$ 401,119	$ 475,364