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Stockholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2017	Mar. 31, 2017
Stockholders Equity Note [Line Items]
Shares repurchased during period, shares		0	0
Dividends declared		$ 0	$ 0
September 2010 Senior Unsecured Notes
Stockholders Equity Note [Line Items]
Remaining other comprehensive loss related to interest rate, swap after-tax	$ 1,300,000
Remaining other comprehensive loss related to interest rate, swap pre-tax	$ 2,400,000

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Stockholders Equity Note [Line Items]

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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Amount before tax, after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
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Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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-Publisher FASB
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