Accrued Expenses - Accrued Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Payables And Accruals [Abstract]
Accrued wages	$ 65,695	$ 57,472
Accrued phone	39,537	42,549
Interest payable	35,702	36,440
Accrued other taxes (non-income related)	35,337	39,267
Accrued employee benefit costs	5,839	4,526
Acquisition obligation for a net operating loss carryforward claim	3,573	5,536
Accrued lease expense	3,026	2,616
Outside commissions	2,922	1,673
Accrued licensing costs	669	2,418
Acquisition contingent consideration	0	2,075
Other current liabilities	32,571	24,662
Total	$ 224,871	$ 219,234