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SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Condensed Consolidating Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Condensed Financial Statements Captions [Line Items]        
Net cash used in (provided by) operating activities $ (26,755) $ 19,411 $ 26,457 $ 14,976
Cash Flows From Investing Activities:        
Cash paid for acquisitions and capital expenditures, net of proceeds from divestitures and asset sales (4,493) (10,877) (12,563) (8,921)
Net cash used in investing activities (4,493) (10,877) (12,563) (8,921)
Cash Flows From Financing Activities:        
Cash distributions       (24,545)
Proceeds from issuance of redeemable convertible preferred units, net 57,500      
Net borrowings and repayments of debt 38,345 (4,044) 1,387 14,341
Proceeds from issuance of common units       0
Other financing activities (18,649) (3,268) (3,955) (1,600)
Net cash provided by (used in) financing activities 77,196 (7,312) (2,568) (11,804)
Net increase in cash, cash equivalents and restricted cash 45,948 1,222 11,326 (5,749)
Cash, cash equivalents and restricted cash—Beginning of period 18,147 6,821 6,821 12,570
Cash, cash equivalents and restricted cash—End of period 64,095 8,043 18,147 6,821
Parent        
Condensed Financial Statements Captions [Line Items]        
Net cash used in (provided by) operating activities       24,545
Cash Flows From Investing Activities:        
Payments to affiliates (57,500)      
Net cash used in investing activities (57,500)      
Cash Flows From Financing Activities:        
Cash distributions       (24,545)
Proceeds from issuance of redeemable convertible preferred units, net 57,500      
Net cash provided by (used in) financing activities 57,500     (24,545)
Subsidiary Issuer        
Condensed Financial Statements Captions [Line Items]        
Net cash used in (provided by) operating activities 212 363 370 103
Cash Flows From Investing Activities:        
Cash paid for acquisitions and capital expenditures, net of proceeds from divestitures and asset sales (188) (363) (370) (103)
Net cash used in investing activities (188) (363) (370) (103)
Cash Flows From Financing Activities:        
Net borrowings and repayments of debt (24)      
Net cash provided by (used in) financing activities (24)      
Guarantor Subsidiaries        
Condensed Financial Statements Captions [Line Items]        
Net cash used in (provided by) operating activities (16,712) 29,462 39,943 28,488
Cash Flows From Investing Activities:        
Cash paid for acquisitions and capital expenditures, net of proceeds from divestitures and asset sales (4,158) (9,888) (11,510) (7,831)
Net cash used in investing activities (4,158) (9,888) (11,510) (7,831)
Cash Flows From Financing Activities:        
Payments from (to) affiliates 47,350 (10,336) (13,782) (38,327)
Net borrowings and repayments of debt 38,517 (4,044) 1,387 14,341
Other financing activities (18,649) (3,268) (3,955) (1,600)
Net cash provided by (used in) financing activities 67,218 (17,648) (16,350) (25,586)
Net increase in cash, cash equivalents and restricted cash 46,348 1,926 12,082 (4,929)
Cash, cash equivalents and restricted cash—Beginning of period 16,298 4,216 4,216 9,145
Cash, cash equivalents and restricted cash—End of period 62,646 6,142 16,298 4,216
Non-Guarantor Subsidiaries        
Condensed Financial Statements Captions [Line Items]        
Net cash used in (provided by) operating activities (105) (78) (73) 167
Cash Flows From Investing Activities:        
Cash paid for acquisitions and capital expenditures, net of proceeds from divestitures and asset sales (147) (626) (683) (987)
Net cash used in investing activities (147) (626) (683) (987)
Cash Flows From Financing Activities:        
Net borrowings and repayments of debt (148)      
Net cash provided by (used in) financing activities (148)      
Net increase in cash, cash equivalents and restricted cash (400) (704) (756) (820)
Cash, cash equivalents and restricted cash—Beginning of period 1,849 2,605 2,605 3,425
Cash, cash equivalents and restricted cash—End of period 1,449 1,901 1,849 2,605
Eliminations        
Condensed Financial Statements Captions [Line Items]        
Net cash used in (provided by) operating activities (10,150) (10,336) (13,783) (38,327)
Cash Flows From Investing Activities:        
Payments to affiliates 57,500      
Net cash used in investing activities 57,500      
Cash Flows From Financing Activities:        
Payments from (to) affiliates (47,350) 10,336 13,782 38,327
Net cash provided by (used in) financing activities $ (47,350) $ 10,336 $ 13,782 $ 38,327