Registration of securities issued in business combination transactions

Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements - Statement of Comprehensive Income (Loss) (Detail)

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Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements - Statement of Comprehensive Income (Loss) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Scheduleof Condensed Statementof Comprehensive Income [Line Items]              
Net income $ 8,118 $ 10,831 $ 17,064 $ 57,265 $ 37,098 $ (50,645) $ (14,708)
Currency translation difference on related borrowings (577) 0 (1,542) 0      
Currency translation difference on foreign currency net investments 2,098 0 2,499 0      
Total other comprehensive gain, net of tax: 1,521 0 957 0      
Comprehensive income 9,639 10,831 18,021 57,265 37,098 (50,645) 14,708
Comprehensive (income) attributable to noncontrolling interest (53) 0 (83) 0      
Comprehensive income attributable to controlling interest 9,586 10,831 17,938 57,265      
Parent [Member]
              
Scheduleof Condensed Statementof Comprehensive Income [Line Items]              
Net income 7,970 10,936 16,843 57,411 37,313 (50,451) (14,461)
Currency translation difference on related borrowings 0   0        
Total other comprehensive gain, net of tax: 0   0        
Comprehensive income 7,970   16,843        
Comprehensive (income) attributable to noncontrolling interest 0   0        
Comprehensive income attributable to controlling interest 7,970   16,843        
Guarantor [Member]
              
Scheduleof Condensed Statementof Comprehensive Income [Line Items]              
Net income 10,817 16,694 27,612 63,505 54,961 (49,106) (1,046)
Currency translation difference on related borrowings 0   0        
Total other comprehensive gain, net of tax: 0   0        
Comprehensive income 10,817   27,612        
Comprehensive (income) attributable to noncontrolling interest 0   0        
Comprehensive income attributable to controlling interest 10,817   27,612        
Non-Guarantor [Member]
              
Scheduleof Condensed Statementof Comprehensive Income [Line Items]              
Net income 11,653 (6,203) 8,939 42,011 32,816 25,428 (12,163)
Currency translation difference on related borrowings (577)   (1,542)        
Currency translation difference on foreign currency net investments 2,098   2,499        
Total other comprehensive gain, net of tax: 1,521   957        
Comprehensive income 13,174   9,896        
Comprehensive (income) attributable to noncontrolling interest (53)   (83)        
Comprehensive income attributable to controlling interest 13,121   9,813        
Eliminations [Member]
              
Scheduleof Condensed Statementof Comprehensive Income [Line Items]              
Net income (22,322) (10,596) (36,330) (105,662) (87,992) 23,484 12,962
Currency translation difference on related borrowings 0   0        
Total other comprehensive gain, net of tax: 0   0        
Comprehensive income (22,322)   (36,330)        
Comprehensive (income) attributable to noncontrolling interest 0   0        
Comprehensive income attributable to controlling interest $ (22,322)   $ (36,330)