Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity and Earnings Per Share - Schedule of Diluted Shares (Detail)

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Stockholders' Equity and Earnings Per Share - Schedule of Diluted Shares (Detail)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Diluted shares      
Basic weighted average common stock issued and outstanding 57,229,435us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 57,298,910us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 57,673,342us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive options and restricted stock   626,091us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 1,158,717us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Total diluted shares 57,229,435us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 57,925,001us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 58,832,059us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding