Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	$ 182,783	$ 213,326
Net cash used in investing activities	(43,191)	(72,542)
Net cash used in financing activities	(130,719)	(135,232)
NET INCREASE IN CASH AND CASH EQUIVALENTS	8,873	5,552
CASH AND CASH EQUIVALENTS, beginning of period	37,711	65,291
CASH AND CASH EQUIVALENTS, end of period	46,584	70,843
Reportable Legal Entities | Parent
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	168,002	158,035
Net cash used in investing activities	(32,647)	(20,643)
Net cash used in financing activities	(130,655)	(132,417)
NET INCREASE IN CASH AND CASH EQUIVALENTS	4,700	4,975
CASH AND CASH EQUIVALENTS, beginning of period	11,378	15,666
CASH AND CASH EQUIVALENTS, end of period	16,078	20,641
Reportable Legal Entities | Combined Subsidiary Guarantors
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	14,781	55,291
Net cash used in investing activities	(10,544)	(51,899)
Net cash used in financing activities	(64)	(2,815)
NET INCREASE IN CASH AND CASH EQUIVALENTS	4,173	577
CASH AND CASH EQUIVALENTS, beginning of period	26,333	49,625
CASH AND CASH EQUIVALENTS, end of period	$ 30,506	$ 50,202