Restatement of Consolidated Financial Statements - Schedule of Restatement Adjustments and Impact on Previously Reported Consolidated Statements of Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net income (loss)	$ (22,197)	$ 251	$ (24,668)	$ (17,589)	$ 47,009	$ 47,210	$ 2,458	$ 13,361	$ (64,203)	$ 110,038	$ (11,301)
Other comprehensive income (loss)
Foreign currency translation adjustments									(13,727)	(37,737)	8,373
Derivative adjustments
Fair valuation of derivatives									7,497	5,237	(5,559)
Reclassification adjustment for loss (gain) loss on derivatives included in net income (loss)									(2,984)	4,608	(10,979)
Unrealized loss on investments									606	(15)	(103)
Total comprehensive income (loss)									(72,811)	82,131	(19,569)
As Previously Reported [Member]
Net income (loss)		46,671	4,436	(7,405)	125,286	48,412	4,340	15,263		193,301	21,793
Other comprehensive income (loss)
Foreign currency translation adjustments										(34,325)	7,105
Derivative adjustments
Fair valuation of derivatives										4,788	(5,041)
Reclassification adjustment for loss (gain) loss on derivatives included in net income (loss)										5,057	(11,496)
Unrealized loss on investments										(15)	(103)
Total comprehensive income (loss)										$ 168,806	$ 12,258