XML 99 R74.htm IDEA: XBRL DOCUMENT v2.4.1.9
Summary of Unaudited Quarterly Results of Operations (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Income tax (benefit) provision $ (86,502)us-gaap_IncomeTaxExpenseBenefit [1] $ 1,017us-gaap_IncomeTaxExpenseBenefit [1] $ 336us-gaap_IncomeTaxExpenseBenefit [1] $ 226us-gaap_IncomeTaxExpenseBenefit [1] $ 140us-gaap_IncomeTaxExpenseBenefit $ 258us-gaap_IncomeTaxExpenseBenefit $ 370us-gaap_IncomeTaxExpenseBenefit $ 411us-gaap_IncomeTaxExpenseBenefit $ (84,923)us-gaap_IncomeTaxExpenseBenefit [1] $ 1,179us-gaap_IncomeTaxExpenseBenefit $ 1,848us-gaap_IncomeTaxExpenseBenefit
Valuation Allowance of Deferred Tax Assets                      
Quarterly Financial Information Disclosure [Abstract]                      
Income tax (benefit) provision $ (84,900)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember		                    
[1] Net income for the quarter and year ended March 31, 2015 included an income tax benefit of $84.9 million, primarily due to the release of the valuation allowance on certain deferred tax assets in the quarter ended March 31, 2015.