Treasury Stock and Subsequent Event - Additional Information (Detail) (USD $)
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3 Months Ended | 9 Months Ended | 1 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2014
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Jan. 30, 2015
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Mar. 31, 2014
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Aug. 31, 2013
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Class of Stock [Line Items] | |||||
Treasury stock, value | $ 351,132,000 | $ 351,132,000 | $ 328,480,000 | ||
Treasury stock, shares | 32,731,909 | 32,731,909 | 32,147,474 | ||
Common stock equals to percentage of outstanding common stock | 62.00% | ||||
Average price | $ 10.73 | ||||
Common stock outstanding | 20,474,606 | 20,474,606 | 20,979,392 | ||
Common stock repurchased shares | 274,483 | 584,435 | |||
Purchase of treasury stock | 9,500,000 | 22,600,000 | |||
Minimum [Member] | |||||
Class of Stock [Line Items] | |||||
Number of shares authorized to repurchase | 2,000,000 | ||||
Maximum [Member] | |||||
Class of Stock [Line Items] | |||||
Number of shares authorized to repurchase | 34,000,000 | ||||
Subsequent Event [Member] | |||||
Class of Stock [Line Items] | |||||
Average price | $ 34.93 | ||||
Common stock repurchased shares | 85,846 | ||||
Purchase of treasury stock | $ 3,000,000 |