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Condensed Consolidating Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities $ 375,373 $ 399,798 $ 423,581
Net cash used in investing activities (122,188) (409,281) (196,887)
Net cash provided by (used in) financing activities (280,765) 381 (230,220)
Net (decrease) increase in cash and cash equivalents (27,580) (9,102) (3,526)
CASH AND CASH EQUIVALENTS, beginning of year 65,291 74,393 77,919
CASH AND CASH EQUIVALENTS, end of year 37,711 65,291 74,393
Parent      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities 295,366 102,371 296,087
Net cash used in investing activities (19,317) (93,891) (73,404)
Net cash provided by (used in) financing activities (280,337) (5,151) (241,993)
Net (decrease) increase in cash and cash equivalents (4,288) 3,329 (19,310)
CASH AND CASH EQUIVALENTS, beginning of year 15,666 12,337 31,647
CASH AND CASH EQUIVALENTS, end of year 11,378 15,666 12,337
Combined Subsidiary Guarantors      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities 80,007 297,427 127,494
Net cash used in investing activities (69,571) (212,215) (102,337)
Net cash provided by (used in) financing activities (33,728) (97,643) (9,373)
Net (decrease) increase in cash and cash equivalents (23,292) (12,431) 15,784
CASH AND CASH EQUIVALENTS, beginning of year 49,625 62,056 46,272
CASH AND CASH EQUIVALENTS, end of year 26,333 49,625 62,056
Consolidating Adjustments and Other      
Condensed Financial Statements, Captions [Line Items]      
Net cash used in investing activities (33,300) (103,175) (21,146)
Net cash provided by (used in) financing activities $ 33,300 $ 103,175 $ 21,146