v2.4.0.8
Parent Company Condensed Financial Statements - Condensed Statements of Cash Flows (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Condensed Cash Flow Statements, Captions [Line Items]      
Net income (loss) $ (111,289) $ (32,714) $ 23,615
Fair value derivative adjustment 36,305 (9,640) (58,740)
Write off of deferred equity financing costs   5,023  
Net cash provided by (used in) operating activities 17,790 30,052 9,931
Net cash provided by (used in) investing activities - investments and advances with subsidiaries (135,052) (78,853) (41,376)
Financing activities      
Proceeds from initial public offering, net of underwriter commissions 173,910    
Proceeds from the issuance of preferred stock     55,386
Other financing activities     57
Net cash provided by financing activities 271,056 118,776 55,153
Increase (decrease) in cash and cash equivalents 153,766 69,985 23,708
Cash and cash equivalents at beginning of period 112,576 42,591 18,883
Cash and cash equivalents at end of period 266,342 112,576 42,591
Parent Company [Member]
      
Condensed Cash Flow Statements, Captions [Line Items]      
Net income (loss) (111,289) (32,714) 23,615
Fair value derivative adjustment 36,305 (9,640) (58,740)
Write off of deferred equity financing costs   5,023  
Subsidiary equity losses 73,895 36,295 34,032
Other operating activities 910 929 957
Net cash provided by (used in) operating activities (179) (107) (136)
Net cash provided by (used in) investing activities - investments and advances with subsidiaries 2,750 4,347 (54,524)
Financing activities      
Proceeds from initial public offering, net of underwriter commissions 173,910    
Proceeds from the issuance of preferred stock     55,386
Other financing activities (2,553) (4,255) (711)
Net cash provided by financing activities 171,357 (4,255) 54,675
Increase (decrease) in cash and cash equivalents 173,928 (15) 15
Cash and cash equivalents at beginning of period   15  
Cash and cash equivalents at end of period $ 173,928   $ 15