Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended					9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Exit Full Valuation Allowance [Member]	Dec. 31, 2013 Federal Tax Jurisdiction [Member]	Sep. 30, 2013 Minimum [Member] Federal Tax Jurisdiction [Member]	Dec. 31, 2013 Minimum [Member] Federal Tax Jurisdiction [Member]	Sep. 30, 2013 Minimum [Member] State and Local Jurisdiction [Member]	Dec. 31, 2013 Minimum [Member] Michigan [Member]	Sep. 30, 2013 Maximum [Member] Federal Tax Jurisdiction [Member]	Sep. 30, 2013 Maximum [Member] State and Local Jurisdiction [Member]	Dec. 31, 2013 Maximum [Member] Michigan [Member]
Income Tax Examination [Line Items]
Reduction of valuation allowance		$ 19,900,000
Valuation allowance	4,201,000	4,201,000	24,131,000
Provision (benefit) for income taxes	10,900,000	(10,549,000)	1,009,000	(2,605,000)	10,900,000
Excess tax benefits from stock compensation		1,466,000
Excess tax benefits related to exercised stock-based awards not included in deferred tax assets	10,300,000	10,300,000
Net operating losses						$ 18,200,000
Net operating Loss Expiration								Jan. 01, 2028
Tax examination year							2010		2008		2013	2013
Tax examination year under examination										2008			2011