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Stock Repurchase Program - Additional Information (Detail) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 05, 2018 | Oct. 31, 2018 | Mar. 20, 2018
Equity Class Of Treasury Stock [Line Items] |  |  |
Stock repurchase program, total cost |  | $ 53,300,000 |
Common Stock [Member] |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |
Stock repurchase program, authorized amount to repurchase issued and outstanding common stock | $ 50,000,000 |  |
Stock repurchase program, expiration date | Sep. 04, 2020 | Mar. 19, 2020 |
Stock repurchase program, number of remaining shares purchased |  | 3,233,352 |
Stock repurchase program, total cost |  | $ 53,300,000 |
Stock repurchase program, average price per share |  | $ 16.47 |
Stock repurchase program, remaining authorized, amount |  | $ 46,700,000 |
Common Stock [Member] | Maximum [Member] |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |
Stock repurchase program, authorized amount to repurchase issued and outstanding common stock |  |  | $ 50,000,000

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- Definition Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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