Supplemental Guarantor Information - Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net cash provided by operating activities	$ 166,228	$ (103,939)
Cash flows from investing activities:
Purchases of property and equipment	(12,002)	(13,142)
Proceeds from sale of property and equipment	17	46
Investments in unconsolidated entities	(25,715)	(712)
Intercompany	0	0
Net cash used in investing activities	(37,700)	(13,808)
Cash flows from financing activities:
Borrowings from debt	850,000	400,000
Repayment of debt	(721,673)	(381,895)
Debt issuance costs	(4,768)	(3,125)
Proceeds from issuance of common stock under share-based awards	921	199
Minimum tax withholding paid on behalf of employees for share-based awards	(5,473)	(3,612)
Share repurchases	(102,001)	0
Intercompany	0	0
Net cash provided by financing activities	17,006	11,567
Net increase (decrease) in cash and cash equivalents	145,534	(106,180)
Cash and cash equivalents–beginning of period	329,011	277,696
Cash and cash equivalents–end of period	474,545	171,516
Reporting Entity \| Issuer
Cash flows from operating activities:
Net cash provided by operating activities	36,321	32,114
Cash flows from investing activities:
Purchases of property and equipment	(4,162)	(4,532)
Proceeds from sale of property and equipment	0	0
Investments in unconsolidated entities	0	0
Intercompany	158,116	(133,658)
Net cash used in investing activities	153,954	(138,190)
Cash flows from financing activities:
Borrowings from debt	850,000	400,000
Repayment of debt	(721,673)	(381,895)
Debt issuance costs	(4,768)	(3,125)
Proceeds from issuance of common stock under share-based awards	921	199
Minimum tax withholding paid on behalf of employees for share-based awards	(5,473)	(3,612)
Share repurchases	(102,001)
Intercompany	0	0
Net cash provided by financing activities	17,006	11,567
Net increase (decrease) in cash and cash equivalents	207,281	(94,509)
Cash and cash equivalents–beginning of period	186,200	148,129
Cash and cash equivalents–end of period	393,481	53,620
Reporting Entity \| Guarantor Subsidiaries
Cash flows from operating activities:
Net cash provided by operating activities	129,907	(136,053)
Cash flows from investing activities:
Purchases of property and equipment	(7,840)	(8,610)
Proceeds from sale of property and equipment	17	46
Investments in unconsolidated entities	(25,715)	(712)
Intercompany	0	0
Net cash used in investing activities	(33,538)	(9,276)
Cash flows from financing activities:
Borrowings from debt	0	0
Repayment of debt	0	0
Debt issuance costs	0	0
Proceeds from issuance of common stock under share-based awards	0	0
Minimum tax withholding paid on behalf of employees for share-based awards	0	0
Share repurchases	0
Intercompany	(158,116)	133,658
Net cash provided by financing activities	(158,116)	133,658
Net increase (decrease) in cash and cash equivalents	(61,747)	(11,671)
Cash and cash equivalents–beginning of period	142,811	129,567
Cash and cash equivalents–end of period	81,064	117,896
Consolidating Adjustments
Cash flows from operating activities:
Net cash provided by operating activities	0	0
Cash flows from investing activities:
Purchases of property and equipment	0	0
Proceeds from sale of property and equipment	0	0
Investments in unconsolidated entities	0	0
Intercompany	(158,116)	133,658
Net cash used in investing activities	(158,116)	133,658
Cash flows from financing activities:
Borrowings from debt	0	0
Repayment of debt	0	0
Debt issuance costs	0	0
Proceeds from issuance of common stock under share-based awards	0	0
Minimum tax withholding paid on behalf of employees for share-based awards	0	0
Share repurchases	0
Intercompany	158,116	(133,658)
Net cash provided by financing activities	158,116	(133,658)
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents–beginning of period	0	0
Cash and cash equivalents–end of period	$ 0	$ 0

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