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Condensed Consolidating Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities $ 399,798 $ 423,581 $ 369,504
Net cash used in investing activities (409,281) (196,887) (125,512)
Net cash provided by (used in) financing activities 381 (230,220) (228,970)
Net (decrease) increase in cash and cash equivalents (9,102) (3,526) 15,022
CASH AND CASH EQUIVALENTS, beginning of year 74,393 77,919 62,897
CASH AND CASH EQUIVALENTS, end of year 65,291 74,393 77,919
Parent      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities 102,371 296,087 211,247
Net cash used in investing activities (93,891) (73,404) (83,895)
Net cash provided by (used in) financing activities (5,151) (241,993) (95,705)
Net (decrease) increase in cash and cash equivalents 3,329 (19,310) 31,647
CASH AND CASH EQUIVALENTS, beginning of year 12,337 31,647  
CASH AND CASH EQUIVALENTS, end of year 15,666 12,337 31,647
Combined Subsidiary Guarantors      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities 297,427 127,494 158,257
Net cash used in investing activities (212,215) (102,337) (56,617)
Net cash provided by (used in) financing activities (97,643) (9,373) (118,265)
Net (decrease) increase in cash and cash equivalents (12,431) 15,784 (16,625)
CASH AND CASH EQUIVALENTS, beginning of year 62,056 46,272 62,897
CASH AND CASH EQUIVALENTS, end of year 49,625 62,056 46,272
Consolidating Adjustments and Other      
Condensed Financial Statements, Captions [Line Items]      
Net cash used in investing activities (103,175) (21,146) 15,000
Net cash provided by (used in) financing activities $ 103,175 $ 21,146 $ (15,000)