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Condensed Consolidating Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities $ 120,309 $ 117,186
Net cash used in investing activities (14,217) (91,581)
Net cash provided by (used in) financing activities (116,567) (25,976)
Net increase (decrease) in cash and cash equivalents (10,475) (371)
CASH AND CASH EQUIVALENTS, beginning of period 65,291 74,393
CASH AND CASH EQUIVALENTS, end of period 54,816 74,022
Parent    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities 117,248 65,048
Net cash used in investing activities (9,174) (32,119)
Net cash provided by (used in) financing activities (113,751) (24,810)
Net increase (decrease) in cash and cash equivalents (5,677) 8,119
CASH AND CASH EQUIVALENTS, beginning of period 15,666 12,337
CASH AND CASH EQUIVALENTS, end of period 9,989 20,456
Combined Subsidiary Guarantors    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities 3,061 52,138
Net cash used in investing activities (5,043) (32,463)
Net cash provided by (used in) financing activities (2,816) (28,165)
Net increase (decrease) in cash and cash equivalents (4,798) (8,490)
CASH AND CASH EQUIVALENTS, beginning of period 49,625 62,056
CASH AND CASH EQUIVALENTS, end of period $ 44,827 53,566
Consolidating Adjustments and Other    
Condensed Financial Statements, Captions [Line Items]    
Net cash used in investing activities   (26,999)
Net cash provided by (used in) financing activities   $ 26,999